Ask HN: Are you a member of any professional orgs? How do you participate?

What professional organizations are you a part of? Why did you join and what do you get out of it?

I've been an on an off member of the IEEE, ACM, and AMS for a few years now and I'm always on the fence as to whether to renew my membership or not.

The journals are nice, but there's few local members in the area I'm in, so it doesn't feel like much more than a magazine subscription to me.