Summary: bebo.com bad, mmkay?
What at first glance seems to be a run-of-the-mill "we provide you vaguely useful service, you provide us email address, our affiliates spam you to hell" setup, soon transpires to be a blatant attempt to steal your digital identity. Do not give it your Gmail, MSN or whatever other password it may ask for. If you do use Bebo and have provided such, I would strongly recommend changing that password as soon as possible. Do the same if you used the same password to create your Bebo account as you use for any them. (Note that it is generally a Bad Idea to use the same password for multiple services.)