Hackspam
When some idiot breaks into your Facebook and blasts spam to all your friends like they're stupid. Then your friends get hacked too because they click the dumb link that makes them look like a total fool.
My mom's Facebook got hacked and she sent a link to my uncle. He clicked it and now his profile is covered in cat memes.
My best friend got spammed with a link that said 'You've won $1000!' He clicked it and now his timeline is full of ads.
My cousin's Facebook got hacked and he sent a link to my grandma. She clicked it and now her profile is all emojis and bad jokes.