https://phys.org/news/2018-07-reputation-twitter-facebook-incur-investor.html

Twitter says it's putting the long-term stability of its platform above user growth. That leaves investors seemingly unable to value what the biggest companies in the sector, which rely on their potential user reach, are worth.

On Wednesday, Facebook warned that its revenue growth will slow down significantly for at least the remainder of the year and that expenses will continue to skyrocket. The next day, the company saw its biggest one-day drop Facebook history,