Gitlab is quite impressive. I've dropped bitbucket for it. I still love github, I find its best use case for me is a great repository of code samples(I've also contributed to several projects ); the social aspect is valuable (to me) because generally the most starred projects are of the highest quality, it's a valuable vetting process.

The curse of the growth hacking is this: there's a fixed number of top developers and hackers on this planet. Once you've crossed that number, the next new user's input decreases the signal to noise. This happens everywhere. (not pointing any fingers to not get down votes... :-)

cheers!