Twitter CEO Evan Williams just announced that his service has 145 million registered accounts and almost 300,000 apps using its API.

In addition to these impressive numbers, he offered up a fairly odd justification for Twitter's decision to create or buy its own clients for various computer and mobile platforms:

We did iPhone user tests and confirmed that even though there was a plethora of third-party Twitter apps, people were having trouble finding and selecting one because none were called “Twitter.” This kept them from using Twitter at all. For this reason, we acquired Tweetie and turned it into Twitter for iPhone, complete... 

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