Having been on the board of directors of a decently-sized hackerspace, I do not recommend it to folks looking to avoid burnout.

Still being on the board of a relatively small (sub-50 regulars) hackerspace, I second this comment. The perspective of spending all of your free time on paperwork and management tasks and no time whatsoever on actual hacking is not helping with burnout.

Not to mention being seen as responsible for interpersonal problems among the membership.

If the final goal is to socialize, founding a hackerspace makes more sense than creating a web platform. (And of course, joining an existing hackerspace makes even more sense.)

However, reading that comment again, maybe the phrases "collaborative atmosphere" and "get together" were not to be taken literally?

I think the issue is that founding the space replaces a lot of "collaborative building" time with "worrying about money and organization" and "being accountable to lots of people" time, which aren't exactly anti-burnout experiences.