Today I received some spam from a guy, sent by linkedin (it comes from their servers).
The message had the email address of all the recipients in the To field, meaning they gave away that email address to that random people I don't know! I was annoyed at their password leak, but it seems they deliberately give email addresses away...
I tried to contact them, the first step to prevent it is their infinite scrolling preventing from clicking on the links at the bottom of the page unless you are very fast.
The second problem is their help center (which it seems you have to go through to contact them) which doesn't load "There has been an error with your request.".