Facebook invitation

I have avoided Facebook. Someone may have told me that they have an account and asked me to sign up. But I haven't checked it out, and I no one have invited me. Till a few weeks ago. I got an invitation from a person back in Sweden. First reaction was "hell, no". But since we have kids in the same age and she's someone I'd really like to be in touch with on a more regular basis, I decided to give it a try. Registered an account without giving any more details than absolutely necessary. Entered, arrrgh!ed and deleted my profile. No way.