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Twitter's (TWTR) got that tweaking itch. Last month, it was rumored the famed 140 character limit would be expanded to 10,000. Now, just ahead of earnings this afternoon, the social media promoter of brevity—and sometimes wit—announced another big change to its business model. But CEO Jack Dorsey is saying it's not such a big deal after all. We're talking about two new features that change how users see Tweets at the top of their feeds.