I'm aware that there are other community sites for various kinds of techies. My question is whether those other sites have the kinds of services that you think

I'm aware that there are other community sites for various kinds of techies. My question is whether those other sites have the kinds of services that you think are valuable. For example, do any of these other sites have a "follow" feature? (Second question - I can imaging the benefits of following someone, but what is the benefit of being followed?) Same for "custom engineer profiles"? Heck - why wouldn't I just use a link to my LinkedIn profile? (Maintaining multiple profiles is a pain....)