» Fri Feb 18, 2011 11:11 pm
I don't want to live on this planet anymore.
All seriousness aside, I can see why this may be somewhat useful in both "lying to people to keep myself out of trouble" and "picking up chicks" ways.
For the former, it's quite obvious. Simple example is: You are gay, don't want your family to know, so you make your facebook all pimped out with fake girlfriends. you don't have to ever get to the "meet my parents" stage of the relationship; just create a new one "before it gets serious".
For the latter, it's social proof. You're essentially saying "look at me, I have a girlfriend" and hoping that some real girl out there will think "well, if he has a girlfriend, he must be worth dating". It's a long shot, but it is a real thing.
I'm sure there are other uses too, but this is just off the top of my head.