some method of incentivizing novelty / importance
Lesswrong upvote count.
Slightly more seriously: Propagation through the academic segments of centerless curation networks. The author might be anticipating continued advances in social media technology, conventions of use, and uptake. Uptake and improvements in conventions of use, at least, seem to be visibly occuring. Advances in technology seem less assured, but I will do what I can.