The Fabric mobile app, which Twitter released a few months ago, is getting a significant upgrade with more powerful analytics. Specifically, Twitter is letting you obsess over your own user numbers with insights on daily new users and retention, where Fabric compares your new user numbers to the same metric from last week. Additionally, developers can now check changes in user behavior with the mobile app. Fabric for iOS and Android will also let you filter crash statistics by version so you can better pinpoint where Crashlytics reports may be coming from. Data is still powered by Answers and Crashlytics, and…

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