Ok so this is a popular topic out there and people have different options on it, but my opinion is that you can use your first name for sure, but not your last name. It's best to not have people to be able to stalk you online and figure out where you live, unless you decide to get into a real relationship with them. Many people do usernames instead of their real names, but again you need to probably use something different than what you use for your other accounts and such. There was a few posts on this forum where family/friends were able to read the public chats of some dating websites becuase their username was something they were well known for. So, I always say that being cautious is better than anything. Once you type info out there, you can't take it back and delete it so it is part of permanent internet!