If you haven't joined Twitter yet, you should. It's the best way to get the most information in a timely manner that I've found. Everyone is on Twitter these days.
If you are wondering who to follow, or wondering why I follow who I follow, here are several reasons why I follow some on Twitter and not others:
1. You give me value. Maybe a great link, a quote, a stat, new website, etc.
2. You don't constantly pimp yourself. Remain humble.
3. You are generous. I see lots of retweets from you and notice you seem to care about otherss and are willing to talk about others and want to help them.
4. You make me think.
5. You make me laugh.
6. You keep me informed. I want to be ahead of the crowd when it comes to news and pertinent info.
7. You tweet in moderation. No overtweeting. A nice steady stream of tweets.
8. You provide a personal connection, and because of that, I actually want to meet you in person. Whether as an individual or organization.
9. You have a picture. Without out, no follow. Your account looks fake.
10. You are a friend. I still follow many friends who are terrible at Twitter. But I still follow them. That's what friends are for!