Definitely fear driven. Recently we've seen the biggest sustained downward drops in five years for tech stocks, I think beginning the process now is just too late.
FAANGMAN is down 22.4% from ATH, and probably in much better shape than Lyft or Uber. I'm probably going to wait for a pop in both prices of these (if they manage to go IPO anytime soon) and then short.
Search for FAANGMAN in https://www.cnbcfix.com/fast-money-archive-june-2017.html