The problem is not the Internet itself but the spread and userbase, some simple solutions:
Make mobile internet super expensive.
Make fast internet at home, outside of special apps(Netflix, games, etc) expensive. Everyone should be able to buy a ticket online but watching HD VR videos of their hatepreacher - Im not so sure.
More free/cheap entertainment for the working class - football, soccer baseball and basketball on free over the air TV.
I have a plan - instead of combatting the bots make their influence smaller by limiting the access to them. Hike up the mobile internet prices would be a good start.