It's all just scientific poking :) but I'd try for example to address the audience instead of describing app it self. Now you have "Twitter Machine - tool packed with features" so maybe just "tool for Twitter stars" or something like it would work better. What you should understand is that you are basically trying to get people to pay for using Twitter :) so you have to be talking with hardcore users and providing some solid arguments.

Hypothetical but I hope it helps :)