With last week's acquisition of techie-adopted Twitter client TweetDeck, UberMedia stepped up as a force in the Twitter ecosystem. Combined with other recent acquisitions of Echofon, Twidroid and UberTwitter, the company now controls 20% of Tweets sent daily. This week, the company is releasing another client of its own - UberCurrent. So why does one company need yet another Twitter app when it has four already?