It's the same reason that SF gentrification articles come in waves on HN. There ...

A_COMPUTER on Feb 13, 2015 | parent | context | favorite | on: How One Stupid Tweet Blew Up Justine Sacco’s Life

It's the same reason that SF gentrification articles come in waves on HN. There is a cause du jour, and it only lasts a little while until the new one.