Where to start?

* They steal the address book of any user who installs their app, collecting private information of people who have given no such consent

* They then proceed to create shadow profiles of all those people that haven't registered, creating the illusion that more people are on LinkedIn than really are (not sure if they still do this)

* They then start spamming all those contacts with multiple emails per day, for several days, asking them to register with LinkedIn. There is no "fuck off and stop emailing me" button, the only way to make it stop is to register for an account

I've blacklisted linkedin.com in my mailservers for this reason. And I would agree with the GP that they are scum and that working there lowers my opinion of a person.