You know what really grinds my gears
Websites that think they can impose new terms of service on anyone that visits, for the first time. Worse off it's reoccurring users and neglects to ask permission from them first. Here's looking at you Soundcloud and so many others then I care to remember.
Since when did this become an acceptable form of confirmation? This isn't even legal if I'm a visitor e.g. I have never seen your terms before; and the only way to have seen these terms would be to have visited before. This is like a bad programming joke of null. What next? By visiting your website, for the first time, their in never seen your terms before, you may have my first born upon page load? The facepalming is endless.