I tried Twitter for about a year. I just didn't care what others were saying (much like Facebook with people saying, "I'm having a sandwich."
It seems like Twitter is mainly the celebrities and public geeks (like the TWiT folks, the Revision 3 folks, etc.) telling us how great it is and how we all should do it but day to day, I don't know of anyone who really gives a crap about it. My kids (24yo and 16yo) who should be the target demographic know of it but also have shown no interest in it.
I was on Facebook for about a year, too, and then disabled my account. My problems were:
- like I mentioned above, for the most part I really don't care what people are doing any given minute. I had a friend or two who'd post funny stuff every so often and I enjoyed reading my kids' pages but I had a lot of friends/family members that insisted on going on about lunch, waking up, how God blessed their lives that day with something (nothing special like their kid making it through some trying time just inane stuff), and found it to be an enormous waste of time.
- What really killed it was when Facebook started posting advertisements as posts from people I knew. I'd see things like, "Fred likes <something>" then a "click here" and it was just an ad. Fred never posted it (I checked), it was just an ad. So, after filtering though all the 'Join me on Farmville' requests plus the sandwich requests the ads weren't welcome in my book. Just more crap to filter through.
I don't fault Facebook for having ads, I just thought it was wrong of them to post them 'as' people. They may very well post something as me and I didn't like the though of that. If I say I like something then I like it. I don't want other people to say, "Brad likes.." as me.
Facebook, unlike Twitter, is a whole lot more popular with folks. Nearly everyone is on facebook. I don't know of anyone who's on Twitter and I really don't have any friends saying, "Follow me on Twitter," or, "What's your Twitter ID." Just seems like a "we're all supposed to like it but it's not really catching on as much as everyone pretends it is."
Worse, I don't -want- to have tweets hit my phone every time someone has a thought. That's not appealing to me at all.