Can someone post a TL;DR
Dont get too excited the payout seems to be set at minimum of $10. So if you want to waste your time signing up for this class action you can get $10 from linkedIn because almost certainly they will reach the max number of complainants and end up only paying each person the minimum. Anyone with a linkedIn account that has ever sent out and invite to join linkedIn qualifies for this suit
it's like some kind of crazy realized game theory problem.