You can't stop Facebook from using you as an unpaid endorser or tainting your news feed with ad pitches, but you can minimize the noise by being judicious about your activities. Before you click a , check in at a shop or restaurant, post an update about a product or service, or install an app that tracks or shares your actions, ask yourself if you feel strongly enough about the product or service to endorse it to your friends. You might still end up being an involuntary shill, but at least you can be selective about it. After all, a little "like" can go a long way.