Linkedin needs to protect it's users better

I'm often surprised how different the experience can be between men and women on certain sites, however this one, I think, takes the proverbial biscuit. https://twitter.com/Hella_Rude/status/526689977464524801 People are hitting on a friend through LinkedIn. I can't see a way through LinkedIn to report this type of behaviour. What I can't fathom is why somebody would even consider doing this through a professional career site like LinkedIn.