Nothing screams "timewaster" like an MMORPG, but at least Luna Online, the latest MMO from gPotato.com, has the decency to allow you to get to the good bits without investing 5,000 hours of your life first.
Equal parts casual-friendly social network (yes, there's even online dating) and hardcore RPG, Luna Online is a genuinely unique game that sports over 50 job classes and saccharine-sweet cuteness to spare.
Luna Online is currently in open beta; all you need is a free gPotato.com account to start playing.