10 Social Networking Apps

Scrabulous may be the best-known word game on Facebook, but it's not the only one. If you're in the mood for a different kind of mind bender, try Text Twirl (available here on Facebook and here on MySpace). This is how it works: you get six letters, and you use them to construct as many different words as possible within two minutes. You earn points for each correct word and can advance to more difficult levels. When your time's up, Text Twirl shows you which letter combinations you missed. We kick ourselves every time we see how many words we failed to guess — and that's what keeps us hooked.

—Anita Hamilton