I would fear fabricated likes and positive comments about "our" papers and fabricated un-likes and negative comments about "their" papers; academic cliques and

I would fear fabricated likes and positive comments about "our" papers and fabricated un-likes and negative comments about "their" papers; academic cliques and individual professors can leverage their students to pollute any StackExchange-like mechanism, and if they have too few slaves there are plenty of PR firms to do the job.