I think this is a marvellous idea, and I'm now an official backer. One thing that I'm worried about is that a "pay wall" sort of model might prevent casual users from signing up. Maybe a paid API / developer model might work better.
For instance, the vast majority of GitHub users don't pay a dime, since they only use open source projects (which are free to host). There are many people/companies that use the paid service (mine included), but we pay for the "added feature" of being able to keep the repo private.
I can't put my finger on it, but something feels unbalanced. So, are paid users simply paying for the ability to post private updates? Or are they paying for access to other users' private updates?
For instance, the vast majority of GitHub users don't pay a dime, since they only use open source projects (which are free to host). There are many people/companies that use the paid service (mine included), but we pay for the "added feature" of being able to keep the repo private.
Good luck with the cause! There's potential here.