linkroll is simple. you hand the remote to the masses of the internet, and let them take you wherever. everyone can submit links, and everyone gets a random link picked out for them when they do so. you give a link, you take a link.
probably not. if you're using a remotely modern browser there's not a lot that can happen. we have a few safeguards in place, but you're better off assuming everyone after this point is out to troll the living hell out of you. don't trust anything, don't talk to anyone, keep your arms and hands inside the cart, and enjoy the ride.