As you know, I have been very active in twitter... and it has become a big part of my day to post things that I find relevant to people that love wine. The problem is... there's so much out there that it has become almost impossible to keep track of the people (and postings) that would matter to you.
I stole this paragraph from http://www.ehow.com to explain my point:
"Twitter is a Democracy
Advantage: You can follow anyone on Twitter, and anyone can follow you. Although there is an option to block someone from following you, unlike with Facebook, you don't have to actively accept someone's friendship in order for them to see your updates. It's easy to accumulate followers passively, and common for strangers to follow your feed.
Disadvantage: Without the advantage of selectively specifying your target audience, your message is in danger of being diluted among the masses. Chances are that most of the people who follow you on Twitter aren't really paying attention to what you have to say."