Not many people seem to use Lion these days though. An app that I work on has less than 6% (of the 13,000 users who have opted in to providing system stats) on Lion.

>> Not many people seem to use Lion these days though. An app that I work on has less than 6% (of the 13,000 users who have opted in to providing system stats) on Lion.

Locking an app to a version of OS is still a bad practice, particularly for an app aiming to network effect. I have Viber and it works on my Lion! Btw, I think that Viber blows away the competition by having everything: VoIP, Pic,Video, Message all for free!

It doesn't run on GS/OS either. Unbelievable.