thanx, in that trend i know cases such as 6yx and rippln, and specially: the "sines" currency of
http://sindicatorobot.org/app/ which are nice, but it would be even nicer to be more directly a lower or higher "miner" of a crypto that gets automatic rewards depending of lower (i.e. logging in --> similar to actual POS minting) or higher interactions (i.e. receiving like from a highly liked, providing service to the whole distributed architecture, etc) in such a social network.
anyway, sure we can learn from how these projects give the rewards more manually and how they resolve the issue of spamming activity floods because of selfish willing to get currency