you gotta ask WHY? what's in it for them if you sell.
i am not saying you should hold. i just want to raise the question that you should have been asking all along about those who create multiple throwaway accounts every day to say the same thing over and over again...
Because they are paid to do so, hired shills always pop up with their FUD when Bitcoin is going down, because the manipulators want it to go even lower to buy the bottom. Also there are many interested parties like Bcash and other altcoins and bankers who would love to see Bitcoin die, so they often use shills to spread FUD. Of course this can't kill Bitcoin, but it can scare newbies, increase volatility, and it's quite cheap to organize such attacks if you hire spammers from poor countries.