Wow, I never knew such things existed
Facebook is riddled with all kinds of tosh and dubious links, some of which can be a bit dodgy. On a couple of occasions I've had a pop up screen shouting at me I'm infected with a virus and insisting I take their 'free' scan. Only way to exit it was to close browser.
Facebook can legally use any pictures you post and they will harvest personal details and post ads on your timeline which they think will attract you to spend money.
But, apart from encountering questionable people in all shapes, sizes and forms, that's about the only peril Facebook will throw at you, as far as I know.
I actually like it, I keep in touch with friends and relatives and some people I don't even know who they are
Can't beat going down the pub and chewing the cud with your mates though