I am a bit cautious about blogging in general being that effective. It reminds me of the Tom Lehrer song "The folk song army":

If you feel dissatisfaction,
Strum your frustrations away.
Some people may prefer action,
But give me a folk song any old day.

If we are going to be effective we need to do more than just "blogging our frustrations away", that is, unless we are sure that our blogging in a way that has an effect. Blogging alone is not action. For those without the huge audience of PZ Myers it can be equivalent to a conversation between friends in a pub. One puts the world to rights over a beer, but nothing changes.

Blogs can be used to discuss ideas, and to arrange campaigns. They can also be used as a resource, where one can archive thoughts and links.

But unless there is visibility, blogging alone is not a step forward, I think.