Sign up for Facebook. This is a website that people use to keep in touch with friends around the world. You can search for people by name, place or network. Find common friends on Facebook and look at their contact lists. See if your ex-boyfriend is on the list or if one of his friends is there. You can send anyone on the list an email asking if they know where he is.

Check out a nationwide online phone directory. You can use search tools to check for him across the country. His name, phone number and address will appear if he is listed. He won't appear if his number is unlisted or if he has left the country.

Join Classmates.com and find people you went to school with. You can search your elementary, secondary and post-secondary schools. Look for your boyfriend or find his friends and send them an email requesting information.

Go to an online forum for your hometown, city or school. Post your request asking for his whereabouts. Give as much identifying information as you can and remember to include your own email address.

Hire an online private investigator to search for you. You can find people who specialize in searching online records and locating people. You will pay for this service or you can use free online people finders.