Price manipulation is done by using many ways.Publishing speculative news in favour of boosting bullish trend is a way.Here on the below link,we could see that news sites continuously release news that bitcoin price is to boom.If we see such moves,we should be cautious about investing otherwise we may get fooled and we might have to regret for our wrong investment.Don't let news media to decide your fortune.
https://www.reddit.com/r/Bitcoin/comments/9dimq2/headlines_two_days_ago_this_is_how_market/Too many manipulators / speculators causing cryptocurrency market became unstable. If they vanished from this world, then cryptocurrency volatility would be reduced to near 0. But we cannot do anything about it, As long you have much money, you can manipulate the market with the coins in your possession.