Unsurprisingly, other people can do the same with you!
Ratings are by anonymous voting. Who your friends are, and what people have commented about you, are viewable by everybody else.
But you CAN review whether you want somebody to befriend you, and you can decide whether you want to accept or refuse comments made about you.
Do this by clicking on your name (next to "Logged in as:" in the Member Bar) and click the Settings Tab. Part way down there are the options you can see in the screenshot below:

We'll see how this feature goes. If it causes the Staff issues sorting out 'fights' between people, we will have to consider disabling it. So please have fun with it, and use it sensibly.
