I think researchgate does that with a social network for scientists. I think if scientists can maintain a personal site (or use their lab site) and put the papers there you can mostly find them with google scholar. Researchgate works as well if you don't want to maintain a personal site. I'm not affiliated with researchgate in anyway but have posted by papers and thesis there which can be accessed via google scholar.

edit:- arXiv works as well :)