Aside from the obvious, a History could be fun, AOL's interest specific chat rooms of the 90's, MySpace which was a place for social profiles and interaction, that became the first online rpg. Social media sites and the art of presenting one's self as someone other than they truly are go hand in hand.
You could write a whole course on the dangers. So many stories on crime shows involve people who got killed when their fantasy leaked into rl. I have a friend who was approached on a social media platform, wooed and lured to go meet the guy, convinced she would divorce her husband and bring her teenage children along, only to be told at the last minute by his family that this prince charming committed suicide and his last words were of his undying love for her. I mean, I see it! She was thrilled by mere psychological abuse, and that this was someone, maybe even just a kid, who was never serious! But my friend was severely traumatized and so into this guy's presented profile, to this day she believes this truly happened. She says, "His family showed me the obituary," no doubt, over the Internet.
I knew a kid 14 years old boy who wrote for a roleplay character on myspace, he ended up receiving loads of gifts from grown women. When his parents found out, it opened up the need to discuss things parents could not even imagine they would need to talk about.
My own daughter at 15 was told she was talking to a boy from her school who moved out of State. This guy was trying to convince her to run away from home to be with him. I strongly doubt that too.
I wrote a popular canon character on myspace, and this lady asked if our characters could have a child together. When I turned her down she wrote me that she "legitimately felt like she lost a child," and was suffering from fits of crying spells.
I have even been told people believed I was in love with them by my ic rp writing.
I consider myself creative, but I can't make this stuff up. It's !@#$%^&*ing scary out there, maybe more than it is a fun pastime. Crazy people should NOT be given access to the Internet! But they are. Same goes for what people are expected to call News today. The most popular News sites are filled with posts from laymen writers, and are written with bias towards the journalist's emotional connection to whatever it may be. In the old days, there was a handful of select journalists who walked into a building daily, who actually knew one another personally, tried to stick to the facts of a story and allow the reader to choose how they felt about things. If the Internet was utterly destroyed tomorrow, I would only miss this RPG, period.