Gone are the days when we eagerly read each others blogs. People, at least tech people in the Potomac area, seem more focused in their reading. Twitter appears to be where engagement is taking place.
Subscribing to someone's twitter feed is such a tiny commitment that people are more likely to make it. Therefore, a Twitter account becomes a crucial tool for engaging prospects and building community. Use your Twitter account to promote your blog posts and other content.
Twitter is the online version of the pre-meeting social. It is a chance to meet people in a relaxed setting. Your Twitter content should mirror your pre-meeting chatter; it is OK to complain about the traffic, but you want to maintain a professional tone.
I like agricultural metaphors, and if you think of blog posts as seeds, then Twitter is the watering can.