F-Secure researchers investigate multiple LinkedIn accounts that recently targeted numerous security specialists in an attempt to map their social graphs. Several of F-Secure researchers received these LinkedIn invitations themselves hence, the company Threat Intelligence team decided to investigate.
Read more here – https://labsblog.f-secure.com/2015/09/03/linkedin-sockpuppets-targeting-security-researchers/
Well, they should also review the scams with financial pyramid which I believe most of the LinkedIn users are receiving every day.