Is there a way to find out if someone has an account not only with myspace, but others similar?

[Thia Bohemia]

For example, let's call this person Zeppo. How can I find Zeppo on other accounts such as facebook, bebo, twitter, twine, delicious, etc. Their email address is unknown, and they can use different usernames as their real names. Is there a way to find people?

[m.arinad]

well if they have myspace,
ask them if they have other accounts on myspace,
or ask in real life.

[lazycsi]

If you use Firefox, use the Who Is This Person? add-on. You would just highlight their name, right click and pick a site from the drop-down menu.

Or you could try to see if they have a wink.com account. It has all sites in one place but only if they have a wink account.