Compromising a page doesn't necessarily have to alter existing content. It would be easy to add a "Download Preview Build" link pointing to a trojan, add links to a fake kickstarter, etc.
You know, I've never really realized that before. It's actually a pretty huge security hole for average users, no? There should be a way to explicitly forbid non-encrypted connections on a DNS level.
That's roughly the purpose of HSTS, but you need to have visited the site at least once first (or in the case of popular sites, HSTS status of a site is shipped with the browser.)
Why do brands keep pushing traffic to the Facebook/Twitter pages instead of their own pages? They should create dynamic interesting content on their main pages and use social media to push traffic towards it instead of using social media as a goal.
Ownership of your following is really important and at the end of the day the only way to do that is to have a proper standalone website.