Social PlugIns are tools that let you easily share a site's content on Facebook. They also show
you content that your Friends have shared.
you content that your Friends have shared.
Platform Apps
Platform Apps are applications that let you fully link your Facebook account to an outside site. When you add a site's Platform App, you'll be able to use your Facebook information to log in to that site, and the activity you do on that site may show up on your Facebook Profile. For instance, a photo sharing site that I use (photobucket) allows me to sign up using my facebook.
Some people feel uncomfortable with the idea of having their Facebook information show up anywhere on the web, while others enjoy every aspect of the Facebook social experience. Most people fall somewhere in
the middle. For instance, you could enjoy using Social PlugIns to share interesting links, but still dislike the idea of having a site share your activity automatically.
No matter what your preferences are, you can control how other sites work with your Facebook account by changing your Apps and Websitesprivacy settings. These settings even give you the option to turn off the Facebook Platform completely.
"Facebook Tips: Social PlugIns,Platform Apps"
Reference : facebook101tipstricks.com
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