The Friends System is a feature in Everybody Edits that allows users to keep in touch by acknowledging a mutual relationship. These friendships are initiated between users where one user sends a friend request via usernames.
To add a friend from the Main Lobby, click the green '+Add' button and enter the username of the target individual. Afterwards, you can delete the request in the 'Pending' section. Friends can be found in the 'Friends' section. Blocked users are in the 'Blocked' section. As a normal user you can only have 60 friends. On the right of a friend's name you can either delete them or block them.
The friend bar's main feature is to allow you to know when your friends are online, and what level they are in. You can instantly hit the 'play' button right beside their name to head to the same level. In a world, friends will have a green username.
Builder's Club Effects
As of 11 April 2013, Builder's Club was allowed to have 20 extra friend slots (40 total) as a "premium" for being a Builder's Club member. They could add the extra friends for as long as the membership was active. After the memberships runs out, however, you can not add any more friends (assuming you are over the limit of 20), but any friends added during the membership will not be deleted.
As with many features, beta members originally tested the Friend System to check for bugs. The system originally used e-mail addresses to facilitate user friendship authentication, but this was changed to allow usernames instead.