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Facebook allows you to sign into a whole load of other websites and services, by using the Facebook Connect routine. Simply click the magic button and if you're already logged in, it'll port a few of your details across to the new service and log you in, without the need to fill out vast forms of details. You can do this with Twitter and your Google account too.
But without Facebook, you'll be plagued with dozens of forms and boxes to fill out each time you sign up to a new service, which subscribes to Facebook Connect. It'll bore you half to death, and you'll wish you kept your account after all!