I do FB advertising when I am not on MN 
I think this has been mentioned before but it's amazing - and frightening - how accurately people can be targeted on social media now.
Give them adverts that nudge them. Give different groups different adverts. Use the right words. Show them the 'right' news. The correct links. Infiltrate their social media and start threads that concern them.
Use dog whistle politics - there was a lot of concern over the London Mayor elections and that.
I think that thinking how the internet drives and influences our politics is scary - yes, we are 'informed' - but are we really being informed?