Twitter

[Cadaverous Pallor]

Originally Posted by Alex

It need not. Twitter would just have to not count "@p" towards the 140 character limit and then filter it out from what it shows when posted. 140 is not the hard technological limit for SMS message lenght, 160 is.

But any individual tweet privacy setting would have to be included in the tweet or exclude use by SMS users.

hmm. Sounds complex to me, but what do I know? As it is, Twitter the service doesn't provide much, it's all the apps that make it super useful and fun, so it'd be interesting to see how they might change to accommodate new ideas.