But even though you can use these services without leaving home, many of them still require you to go to a specific Web site — one you wouldn’t necessarily visit regularly. Sites like Gazelle.com and Venjuvo.com that pay cash for old electronics (or just recycle them) aren’t exactly online destinations.

Now one of those ways to unload your stuff involves a Web site you might visit many times a day. A site that has considerable sway in the social-networking world, where over 175 million active users go to share personal stories, photos and videos with hundreds of “friends.”

That’s right, I’m talking about Facebook. Tuesday, the social-networking giant announced its new Facebook Marketplace, Facebook.com/Marketplace, an integrated application powered by Oodle, known for its work with online classified ads. Marketplace uses colorful icons to represent four actions you can take in its app: Sell It; Sell for a Cause; Give it Away; and Ask for It.

Facebook Marketplace users can pick from 12 categories of listings, as well as buy or sell items for a favorite cause.

Oodle granted me early access to the Marketplace app before it became available Tuesday. A friend of mine and I were both set up with test accounts so that we could see one another’s fake Marketplace items and interact with one another within Marketplace; hundreds of Oodle employees also were testing this. (It was fun to see what people offer for sale when they’re just pretending, like one person who offered to sell everything on a colleague’s desk when he was out.)

Facebook’s original iteration of Marketplace started back in 2007, but was geared toward services like housing and jobs. The Oodle-powered Marketplace is merchandise-centric and includes more detailed organization, deeper integration with Facebook, and ways to buy or sell things to raise money for 1.7 million causes.

It still lacks a built-in electronic payment system, such as PayPal or Discover card, for exchanges between users or donations to causes. Instead, Marketplace encourages its users to exchange money however they choose, like traditional classified ads. And that could cause some obvious problems. For instance, if an item were sold for a cause, the seller could later donate the amount via credit card after closing a listing. But there’s no guarantee that the seller will actually do this. Oodle says it will listen to feedback from the Facebook audience and will try to integrate e-payments, if preferred.

Every posted item can include a location, description, category, photo and an explanation of why it’s in the Marketplace. Each item is reviewed by Oodle’s fraud-detection program, which looks for inappropriate content and suspicious activity, and a post could take up to 30 minutes to appear online after you submit it. My posts displayed almost instantly in the Marketplace newsfeed. Users also can opt to publish their posts to their Facebook profiles.

One example of Marketplace’s newly detailed organization comes in its browsing options. The old version of Marketplace had options to browse through jobs and housing, but not specific categories of items for sale. Now, users can browse through 12 categories of specific items including “Home & Garden,” “Baby & Kid Stuff,” “Tickets” and “Musical Instruments.” Items that don’t fit into these 12 categories are put into an “Everything Else” category.

Each item in Marketplace integrates with Facebook’s familiar format, like having its own online “wall” where questions and comments appear. If you’re looking for something in Marketplace by using the “Ask for It” option, you can recruit people to help you find the item by selecting from your list of friends, which works the same way people can suggest Facebook people to friends who might know them. Glancing at an item shows the seller’s profile photo, a link to all of the person’s listings and a brief history of his or her overall Marketplace activity, such as “3 listings in the last month.”

The integration of charitable causes into Marketplace gives supporters new ways to raise money for a favorite group like the World Wildlife Fund or Habitat for Humanity International. On the Marketplace home page, causes are displayed in a right-hand panel with a daily featured cause. This Featured Cause shows who else supports it and how many items you can buy or sell to support it.

Privacy is a natural concern in online marketplaces. By default, your posted listings are visible to any Facebook member in Marketplace. Users can opt to remain anonymous — they’re listed as “Facebook user is selling a bike,” for example. In that case, the only way someone can contact that person is by posting a comment and waiting for the seller to respond.

People who aren’t members of Facebook can see your listings by browsing and searching Marketplace, but they can’t post, comment or contact users. Unlike online marketplaces or services that can be used by anyone, Marketplace requires that users be members of the site to interact with sellers, which can be a downside. Plenty of people who aren’t on Facebook might not want to join the social-networking phenomenon just to offload the old couch gathering dust in the garage.

All user notifications — messages indicated in red at the bottom right of a Facebook page — will reflect friends’ activities in the Marketplace, unless you reset the notifications of the Facebook Marketplace app to not notify you. I suggest doing this, unless you really want to know about all your friends’ activities in Marketplace.

Four color-coded icons represent activities in Marketplace and are useful when reading lists of items at a glance: A green dollar sign represents Sell It and a red heart represents Sell for a Cause, for example. And details about each cause are integrated within Marketplace.

The Oodle-powered Facebook Marketplace is straightforward and well organized, and if you’re a Facebook user, its format will be familiar. If you’re not, and you’re looking for a way to sell or give items away for a charity or otherwise, Marketplace might encourage you to join the giant social network. But its payment program could be made a lot easier with electronic options.

Edited By Walter S. Mossberg

• Email us at mossbergsolution@wsj.com. Find this and other columns and videos online free at the All Things Digital Web site: http://solution.allthingsd.com

I headed online to start researching (I was looking for a used car) but was overwhelmed by an avalanche of information. Everyone seemed to have something to say about cars, whether in blogs, community forums, editorial reviews, Kelley Blue Book values, Carfax reports or local dealer sites. As I discussed my findings with friends and family, more people than not were surprised to hear about the variety of research and price comparisons available online.

This week’s column is an overview of sites that may help you or someone you know browse for a new or used car on the Web. I used sites ranging from trusted resources like ConsumerReports.org to search engine tools like Yahoo Autos. This column can’t possibly mention every car-searching resource on the Web; rather, it’s just a taste of what’s available.

Edmunds.com and ConsumerReports.org both feature informative data on a number of new and used vehicles. Edmunds is a free site specifically geared toward cars, including an online magazine for enthusiasts called Inside Line and a Web forum for discussions about automobiles called CarSpace. I used various tools on Edmunds.com, including one that estimates the true cost to own a specific car over time. I especially enjoyed reading an article titled “Confessions of a Car Salesman,” which proved uncanny in predicting a range of tricks and techniques the salespeople used when I first visited a car dealership.

Edmunds offers a four-step pricing system, which includes getting quotes from dealers, and a payment calculator, which estimates monthly payments. Edmunds teams up with AutoTrader.com to help perform searches for certified pre-owned or used cars online.

Consumer Reports covers products as well as cars but keeps much of its most useful data behind a Web-site subscription, which costs $26 annually or $5.95 monthly (magazine subscribers can pay a discounted price of $19 a year). You need this subscription to access CR’s respected ratings and certain sections of its Web forums. These ratings were helpful to me, as they assessed numerous aspects of specific car models, including trouble spots by year, performance, safety and fuel economy.

CR also offers valuable lists such as “All Recommended Cars,” “Best and Worst Used Cars” and “Reliable Used Cars by Price.” A car-buying calculator is an asset to this site that helps you decide whether it would be smarter to buy or lease a vehicle.

Google, Yahoo and AOL all present special search-results pages when you search for a specific car for sale, using drop-down menus and various ways to sort results. Google Base for automobiles, found by selecting “Vehicles” from www.google.com/base, is a list of data submitted to Google. Drop-down menus help broaden or narrow results by sorting the data according to certain attributes, such as make or price. Vehicle-search results can be viewed in one of three formats: List View, Table View or Map View — an illustration of each car’s location in relationship to a Zip Code. I found Table View most useful because it organized data in smart, spreadsheet-like displays so I could quickly skim through columns listing price, color, amenities and mileage.

But not all car searches within Google Base returned the same drop-down-menu options for sorting. In a few instances, I couldn’t sort my search results by model year. Google Base does show the date on which each car was listed.

Yahoo Autos, found at www.autos.yahoo.com, teamed up with Cars.com to offer richer content, including a Car Finder feature that helps people narrow down what type of new car they might like according to price, driving style and fuel (type and economy). Yahoo even tries to answer car questions with its Yahoo Answers Q&A tool, which lets people submit questions. I found user reviews on this site, as well as expert reviews provided by NewCarTestDrive.com, an auto-review site.

The used-car section in Yahoo Autos reminded me of Google with its drop-down menus and results that displayed in list or map views. List view shows plenty of information in one glance, including an image of the car for sale and the number of additional available photos. From this list, users can link directly to view or order Carfax reports or email the dealer, saving time wasted on excess mouse clicks and browsing.

AOL Autos, found at http://autos.aol.com, does a nice job of integrating Web 2.0 features such as pop-up menus that appear within a page rather than in an entirely new Web page. Vehicle-search results are found by entering a few criteria for a new or used car, and used-car results can be further narrowed by adding or subtracting desired specifics listed on the far left of the screen. Some specs include model type, engine, year or extras like heated seats or a sunroof.

This site can also condense numerous used-car listings into one graph that illustrates car prices in relationship to mileage or year. Selecting any point on the graph reveals a short description of a vehicle’s location, price and mileage. For new cars, AOL Autos offers lengthy expert reviews from NewCarTestDrive.com, as well as user reviews.

Both Yahoo Autos and AOL Autos walk users through steps to get price quotes from dealers for new cars.

Carfax.com provides car-history reports using vehicle-identification numbers, or VINs. For a $30 fee, used-car buyers can use Carfax.com for 30 days. This report shows a vehicle’s history such as if it was a rental or not, how many different owners it had, how long each owner possessed the vehicle and where it came from. Tips pop up within these reports, including one that warned me about “curbstoning,” a term that describes an individual without a dealer’s license looking to sell a number of cars by posing as a private seller.

As can be expected, many newspaper Web sites offer automobile sections that display digitized classified ads, so be sure to check your local paper’s Web site.

At the end of the day, test-driving a car will be a true test as to whether or not you like it — no matter how much research you’ve done online. But knowing your stuff before you visit a dealership can save money and time.

• Email mossbergsolution@wsj.com.