With $315 Billion mcap, cryptocurrencies aren't a concern yet that such a manipulation is required to drive the market. Market is mainly being manipulated by the exchanges who have all the detail about sell and buy order and the bots which manage the bulk trade for the big holders and traders. Those bots run on algorithms that are tough to crack and are quite fast. Right now, manipulation at the level of Cambridge Analytica is quite absurd.
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But my dear friend, audience these days is not as stupid as you think!! They use their own minds and brains, then come at some conclusion. If not all then I would say more than 50% of the people would try to analyze the situation then would come at a rational decision!!
It's not only about the social media that you've been emphasizing, there are hell lot of other methods to grab attention of people. But yes, nothing is as reliable n faster as social media is!! But manipulating people is not that easy these days. It requires a great deal of thought and effort to make people believe certain matter!
Crypto market is highly amateur at the moment. Manipulation is indeed easy and that domino effect can be created by just a single piece of rumor not even a news is required. There might be people who think or analyse the news. But when the majority traders are selling or buying, market suffers.