Bebo is a social networking site open to the public. Facebook licensed off the Facebook Developer to Bebo so that developers can also build applications for Bebo. There are slight differences between the two, but it is not difficult to port an existing Facebook application to Bebo. Any social network can utilize the OpenSocial platform. Facebook may follow that path and open up the Facebook Developer Platform.
View Adam Cox's Bebo Profile.
View the Random Thoughts Bebo Application.