> The problem is that there's nowhere to run from the Internet. I can avoid tobacco stores, I can't avoid my iPhone.

What's stopping you from not having social media apps on your phone, or even using a web browser? Nothing. Like quitting your tobacco, stop making excuses and just do it. As for social events, if none of your "friends" choose to invite you to social stuff over an SMS or a phone call if you were to quit FB, then that's not friends I'd care to keep.