Not only do every day people use social networking sites like Hi5 to meet new people and stay in touch with friends from all over the world, but so do some very famous people. Though some networks are more popular than others, you may be surprised to see who ends up where. You won't find the phone number for your favorite recording artist on these sites, but you can find the phone number of an old friend if you search through them to see where they pop up. Hi5 is an easy one to try first.

Each person has their own view of what is okay to post online and what should be kept off a profile on any social networking site. Just because you think posting your phone number is a mistake does not mean others think the same way. Some people put numbers up in the hopes that old friends will find them and call them up. Though there are some that keep profiles open to friends only when they list a phone number, others leave it public. That could be to your benefit.

Start on Hi5 with your own profile account. You may not be into social networking, but having your own account helps with your search. You can always get rid of it later if you wish. Once you have set up your profile, you can then use a feature on Hi5 that allows the site to go through your email address contacts to find an email match. If you get one, you can then instantly go to your friend's account to see if they have a listed number.

Hi5 also has a variety of searches you can try with any information that you may have on your old friend. Only use details that you are sure are correct at this point in time, or you search could bring up nothing when the person is actually there. If in doubt about any search option, leave it blank. Don't forget to plug into the many networks (like schools and colleges) to see if you can find someone that way.

If you find a number, but want to be sure you have the right one, you can use a reverse lookup to confirm. You can also use this if you have an old number, but you are not quite sure if it belongs to your friend or not. When you a reverse search to lookup a number, you can verify things before you pick up a phone to call.