Linkedin spam attack

I was already wondering over the past weeks about the increased number of Linkedin invitations by colleagues with whom I was already communicating, now I know. By ignoring and clicking off one of these invitations, I must have pressed the wrong button, and, as a result, Linkedin spammed all my contacts and all my email addresses with invitations to Linkedin - which resulted in me writing numerous apologies, emails ...
Again, sorry, to everybody who has received an unsolicited invitation. I can only recommend, NOT to use Linkedin after this experience.