Have you ever browsed Facebook, Twitter, or your e-mails and found an irresistible quote, perhaps shared with you by one of your online friends? A quote you’ve never read, a quote from some famous person, a short, pithy message that was too memorable not to pass on? And so, even if you aren’t the online “sharing” type, you give it a shot; point-click-send, and there it goes to all your friends, followers, or contacts. You’ve just become another link in a chain, spreading some inspiring nugget across your little slice of the social network.