I’ve been thinking about this a bit lately: growing your own Twitter clone that gives a private circle of people access to both the crowd and the single user via desktop and mobile device. Other people are just looking at the possibility of growing clone services that aren’t reliant on Twitter’s groaning infrastructure. A surprisingly useful post on Techcrunch lays the problem and the possibilities out:
The key weakness in Twitter (and therefore opportunity for a new decentralized approach) is the fact that so much Twitter activity occurs off Twitter.com. Users are getting very used to using desktop clients (Twitterific, Alert Thingy, Twhirl, etc.), IM, SMS, and other interfaces to talk to Twitter. Those third party applications can be tuned to lock in to the new decentralized Twitter-like service instead or in addition to Twitter itself.
There also look to be possibly useful bits in the comments section.