Twitter today updated its mobile applications with several new features. First, Twitter now lets users attach up to four photos to a single tweet. Second, Twitter now lets users tag up to 10 friends in any given photo. The tags don't count against Twitter's 140-character limit. Users will be notified if they are tagged in a photo, and can adjust the notifications if they so wish. The updated app for iOS devices can be downloaded today. The updated app for Android will be available soon.


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