Twitter is full of bots. It should be no big surprise to you, I hope. Bots make the service essentially less useful. For example, how do you know how many out of the 2000 followers are real people with opinion that is valuable to you or your community? You don’t know! Any newbie programmer can code up a simple script to post thoughts, retweet and sync feeds and do other things to the extend you no longer can differentiate between real and spammy traffic.
This is primarily due to the fact that twitter relies on smaller contributions from its userbase (140 characters message), which is significantly easier to imitate than a whole blog post for example. Moreover, messages can be as vague as it can get and in fact, most of them are. Now add the easy to use programmatic access and you have a recipe for disaster.
This leads us to the obvious (to some) conclusion that twitter is not a reliable source of information. Clearly, it can be abused and it is evident that it is abused but not to the extend we will see it getting abused in the future. Twitter is quite popular, no doubt about that, but is it useful? Probably not! I will stick with blogging!