'"Share your papers" solves a problem no academic has. But getting notifications when anyone from a list of people I know shares a paper would be genuinely usef

'"Share your papers" solves a problem no academic has. But getting notifications when anyone from a list of people I know shares a paper would be genuinely useful.' Indeed when I worked for http://philpapers.org http://philpapers.org this was quoted by users as the main reason to use it.