In Facebook, friends like my status when it's cheesy.
In Google +, people +1 my update when it's geeky.
In Twitter, people RT when it's spammy.
In Facebook, it's easier to Like than to Comment.
In real life, it's easier to like than to commit.
In Twitter, you are defined by those whom you follow - not by who follows you.
In Google +, you are who defined by whom you include in your Circles.
In Facebook, you are who your friends post on your Wall.