If you've never run a site out of the EU, you probably don't know about their cookie law (which means you may be breaching it).
Here is all the information that you'll ever need. If you clicked that link, you will have seen a cookie control pop-up in action. There are many different variations of this, but that one is a pretty good one, and is the one that we are going to be using on our new site when we launch.
You can find out more information about that pop-up, or buy it, here. (We are in no way affiliated with it.)