I'm also a gen-y member and this is exactly the same way I use Twitter. I keep Facebook strictly limited to people I have met in person, face-to-face. On top of this I have most of my account locked down so that only friends I mark as "close" can see all of my information. For Twitter I don't mind following some popular developers, tech folks, etc. I also don't tweet that often - I usually just follow those that interest me.