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/Thank you for good advice.
In fact, manipulation is very often in media, politics, economy, everything etc.
Since many very young, inexperienced users invest in the different markets, crypto, Forex, stock markets etc. money they can't afford to loose, they are usually very emotional and afraid to loose.
So, it's very easy o influence such investors and manipulate.