As we've been saying here for some time, these issues of Integrity, Autonomy, Portability, and Security of Individual and Team Lifestreams are going to become increasingly obvious and pressing.
Yesterday, NextWeb supplied yet another interesting way to "Create your own version of Twitter with REAL status updates" wherein Zee specifies the following goals:
1. Have something you can update from anywhere and as many devices as possible.
2. Make it possible to share only specific updates with the world (i.e. on other social sites).
3. Make it possible for people to comment/respond from other social sites or from your site itself.
4. Embed photos/video easily.
5. Make it searchable. So you can see updates (thoughts, images, video) that happened between two specific dates.