All those random HR people from random recruiting companies adding you on LinkedIn.

STOP.

my solution:
1. get tired of the never ending spam
2. delete LinkedIn profile
3. ???
4. profit

Unless you a student soon to graduate, in which case they are invaluable at throwing you roles.

I will happily add them to my LinkedIn connections for a rather generous fee.

I have a pending queue of 50 of these fuckers. When someone appears to be too annoying (visually) I click "I don't know this person". If it works like Facebook this should eventually disable their option to send invitations for a while.