Internet phenomenon Twitter has this weekend acquired Tweetie, a Twitter client for the iPhone and Mac platforms. Tweetie is one of the best mobile Twitter apps and will now be offered for free, instead of the £1.79 it currently costs in the App Store. Which doesn’t matter that much at the moment – although Tweetie for free isn’t a bad thing – but with their own mobile client, Twitter would be able to provide whatever updates or features they want – a URL shortener and photo uploader would logically be next. And if Twitter does acquire all the necessary components and offer them as a package, they’ll have total control of the medium.