Online Identity

How many online identities do you have ?What are they like?
In what ways are they different to your "in person"identities?
What are some benefits of expressing one's identity online?
What are some risks?


I have 5 online identities, for example,the accounts of  forum, msn, hotmail,yahoo,xanga.They are different because I always avoid using real personal data like real name, birthday or mobile phone number etc.Because it in not safe to post the real personal data on the internet.Some people may easy to steal your personal data online.Also, I will not post my real photo in the internet, it is better to use other picture instead.For the benefits,  we can make more friends and keep contacts with some old friends.