Opt-out of behavioral advertising
Ad networks like DoubleClick, Quantcast and others track the websites you visit and target ads specifically to you. To opt out of these tracking networks, go to the Network Advertising Initiative (NAI) website. It will check your system for tracking cookies from the participating ad networks and allow you to opt out of receiving them.
If you want to block ads and ad tracking altogether, you can install an ad blocker plugin for your browser: