Doesn't bother me really, everything online is stealing your data anyway seems a waste of time to just attack Facebook.
I find it really useful to keep in touch with my friends and family that are scattered around the world.
Me and my old college buddies have an mma chat thread on there thats been running for years.
It makes it really easy to coordinate people for birthdays, parties, holidays and events in general.
- I'm going to Berlin in two weeks with my friends in London arranged through Facebook.
- Going to Slovenia in June for a Stag Do organised through Facebook
- Wedding in Australia coordinated through Facebook
- End of the month my mates organised a festival event for his birthday through Facebook with a bunch of bands
- Bunch of other 30th weekends away and engagement parties etc
Point is if you've got lots of friends it's very useful for keeping in touch.
If you got no friends and are just paranoid in general then sure delete everything and stay in the basement.