Many of Facebook’s users are still in high school. Some are even younger than that (it isn’t hard to lie about your age on the Internet). And many of these people simply don’t understand that Google is forever. Just look at Facebook’s Vanity URLs for proof: Facebook made it very clear that these are permanent, which means that you’re going to be stuck with the same username five or ten years down the line. Yet there are still countless users grabbing names like ‘drunkdude’. That’s going to look great when your boss tries to add you as a friend.

Beware of the nicknames you use. And if you do business on the Web, don't use any: use your own name.