Ive found Twitter goes beyond celebrities. It's great for live events like conferences or debates or whatever, even ones that are too small for major media coverage. When something is happening, you get live journos and bloggers live tweeting the breaking news, and the surrounding discussion is good too.
> Twitter's really just good for tracking celebrities.
What? Twitter has become the dominant platform for breaking news. It's also got a decent number of niche communities (I'm pretty active in NBA Twitter, for example).
I use Twitter to connect, meet, and talk to other devs. Maybe it's similar to "tracking celebrities" but it's been a boon to my career and learning (with moderate use, of course).