And here's something it took me a long time to learn and adapt to:
Just because somebody is really cool/smart/one of your favorite thinkers, doesn't mean you should follow them.
When I first got to Twitter, I followed a lot of the writers/programmers/thinkers I admired. And while I still admire their work and think they're inspirational people, I had to unfollow many of them for the following reasons:
* They never tweeted about the things that otherwise made them interesting to me (they have every right to do this, just not a good fit for me on Twitter.)
* They used Twitter as their venting medium. (Well-known people tend to fly a lot, go to hotels a lot, and have many opportunities to be let down by "incompetence." Twitter has been their preferred medium to talk about such.) Again, I think this is fine. It's actually really healthy to vent. But it's not so great to hear it all the time.
* They were stressed a LOT. And it made me stressed. It makes sense. Productive smart people that are interesting to me are probably busy and have meetings and deadlines etc. But I felt their pain too acutely.
Anyway... I think Twitter is great. And everything I mentioned above is fine in moderation. (And it's even fine in abundance, just not for me.)
Really put some time curating your Twitter follower list, and it can be great.
The trajectory is exactly like a fad, some popular people do it, everybody does it, it becomes mundane, then popular people leave, everybody leaves, fast forward 10 years and everybody makes fun of it.