It's hard to know for sure, since previous surveys were only advertised on the LessWrong.com domain, but it doesn't seem like the diaspora thing has slowed the growth of the community a ton and it may have dramatically accelerated it.

My impression is that a big part of the increase in survey responses was that this was explicitly advertised as a diaspora survey, with a number of people saying things like "if you're reading this, it's for you."