I suspect it depends on what the existing reputation is. I recall a discussion here on Hacker News where someone asked why people weren't using Google+ for soft

I suspect it depends on what the existing reputation is. I recall a discussion here on Hacker News where someone asked why people weren't using Google+ for software blog posts anymore, and the response was that they'd broken all the links. I'm sure that wouldn't have been an issue if it was super popular and respected, but it was already fading away at that point.