I had the same experience with this site!
Got my contacts mailed! When I noticed I immediately wrote their helpdesk. Turns out because I clicked 1 connect button I gave them the permission to invite contacts!
I don't care if I click 100 times, you don't just go sending mails to my contacts withouth asking me if I'm sure each time! What if I clicked by accident?
Of course they were covered by the terms and conditions. They deleted my contacts after I complained.
Don't import your contacts and if you did, ask them to delete them!
I'll be fair, the site is ok to chat, and they reacted fast when I complained (this is the only reason for 2 stars) but this doesn't justify the spamming.