Keeping in Touch...
I have found that my main blog Ramblings of an Insomniac, while not having mass appeal, does help me keep my "circle" in the loop...
(and who would want a circle outside the loop!)
Use your blog to keep in touch with those you don't get to talk to frequently, to share good news and to explore new ideas.
Remember that blogs are a tool. Applied to networking, blogs will establish and GROW your relationships.