Does anyone know how to search for soemeone's email address?

Best way to find an old friend online is by searching for communities and groups in social networking sites that you and your friend were together like work place, college, location surnames etc.Finding email address online is very difficult as most of sites have hidden email features on social networking sites to reduce spams. you can only find a person by first name last name, work place, college studied, living area etc.

look for your friend in social sites like friendster, myspace, twitter, facebook, skype etc. if you get lucky you will find his/her info in that social site, and that will include an email add and tel no. Goodluck.