It's not perfect but it makes it possible to spot lies. For example if you manage your company's profile on LinkedIn you can see when a new person says they've

It's not perfect but it makes it possible to spot lies. For example if you manage your company's profile on LinkedIn you can see when a new person says they've started working for you, and you can click a "they don't really work here" button. Of course people can still claim to work for "Y C0mbinator", but then on their profile it won't click through to the same company as listed on other people's profiles. It also let's you make better judgements on likelihood they're lying. It's not impossible to create an authentic-looking fake profile, but generally speaking if you see someone claiming to work for X company and connected to lots of employees from X company it's a safe bet that they worked there.