Speaking personally, I realized one day that without intending to I had developed a critical community around my blog, a group of people who were willing to save me from my own lousy classroom design choices. They got better at giving criticism and I got better at receiving it.
There are generations of math education bloggers that stick together in fascinating ways. Perhaps it goes without saying that math edubloggers start by reading blogs, then commenting on blogs they read, then writing their own blogs. (Not unlike every other kind of blogger, I suppose.)
Totally anecdotally, new bloggers seem to interact primarily with a) bloggers who started blogging in their same generation and b) bloggers who started blogging in the previous generation.
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