I saw your blurb!
All I've noticed is that with the latest system, I've seen less and less fresh blood resurfacing much after saying a small comment or hello in the "Welcome to Hubski" thread.
I took a leap of faith with a few users over time, discerning they weren't bots.
I've promoted a few people as well. To be honest, though, I don't really have a better solution to suggest.