Well, they had a security breach in 2012 that leaked 6.5 million unsalted password hashes: http://techcrunch.com/2012/06/06/6-5-million-linkedin-passwords-repo

Well, they had a security breach in 2012 that leaked 6.5 million unsalted password hashes: http://techcrunch.com/2012/06/06/6-5-million-linkedin-passwords-reportedly-leaked-linkedin-is-looking-into-it/ http://techcrunch.com/2012/06/06/6-5-million-linkedin-passwo... They have also been sued for stealing users' e-mail address books and spamming all their contacts with invites: http://www.wired.co.uk/news/archive/2013-09/23/linkedin-sued-by-users http://www.wired.co.uk/news/archive/2013-09/23/linkedin-sued...