LinkedIn is the world’s largest social networking site for the business world. It’s also one of the most prolific legitimate senders of spam (if there is such a thing) on the Internet. Now, it’s being sued by four users for doing just that.The suit has been filed in California by four LinkedIn users, including a former New York Times advertising exec. Their claim alleges something a bit more serious than overzealous emailing, however. They’re saying that LinkedIn hacked their email accounts and downloaded “all email addresses associated with those accounts.”If you’re thinking that this sounds an awful lot like what LinkedIn asks if you want to do when you sign up or install its mobile app, you’re right. You’re given the opportunity to ping everyone you’ve ever had contact with — all you have to do is give LinkedIn the thumbs up.It’s easy enough to do if you’re not paying close attention, too. Users who hurry through a registration process and don’t pay enough attention to the prompts often click on things that they don’t recall clicking on later. That’s not a scenario that’s unique to LinkedIn.The four “victims” here claim that LinkedIn never asked them for their Gmail passwords. It wouldn’t of course. The likely culprit is the Google Account login windows we have all seen so many times: LinkedIn hasn’t made a statement about the case yet, and it’s likely they won’t offer any real insight since this is a court matter now. It’s reasonable to assume, however, that they’re going to play the “read the TOS” and “pay more attention” cards.Someone also needs to speak with the attorney on this case and explain what hacking is.