https://www.cnbc.com/2018/01/12/whoops-analyst-downgrades-facebook-stock-hours-after-recommending-it-as-shares-tanked.html

One Wall Street analyst abruptly changed his view for Facebook shares within hours after seeing a big drop in the internet giant's stock price.

Facebook announced on Thursday major changes to the company's News Feed. CEO Mark Zuckerberg said the internet firm will start prioritizing "meaningful social interactions" versus "relevant content," and that he expects the time people spend on the social network will go down as a result.