There are connections, suspicions and strange relationships but no hard evidence. More opaque news than fake news.
Those who study these things have long been scratching their heads to try to find out why the Tories won the 2015 election when the opinion polls and the pundits said they should have lost.
It's quite possible that social media made the difference even though the usual excuse is that poor, young, badly educated people did not bother to go to the polls despite telling the pollsters they were going to vote Labour. Perhaps.
What worries me is not the ability of political parties to target individual electors with tailored messages. Sorry, but I don't believe in the tooth fairy or Santa Claus either.
A few pithy messages on FB are not going to change the world, or the world view of people who are opposed to your policies.
The great example of a social media campaign was Obama's first election. What he did was run a registration campaign. In other words, he was motivating people who were already in the bubble, latent support. This was the whole point of the Reading Pad system, a method that helped win many great election victories. Motivate your supporters and get them to the polls.
Opinion polls prior to the 2015 election. Given the oft repeated advantage the electoral system is supposed to give to Labour because it tends to win smaller constituencies, and the likely support of SNP, Labour should have won. Source http://ukpollingreport.co.uk
What might would be subtle changes to the algorithms used by the social media companies determining the things that appear on your screen; your world view in a real sense. Now if that power existed that really would frighten me.