In case anyone doubted Twitter’s commitment to photo-sharing the company added a couple of features Wednesday that made its direction clear. You can now add four photos to a single tweet and for the first time, you can tag up to 10 friends in a Twitter photo, without taking away from your 140-character count. The photos you add will appear as a four-part collage in your timeline. If anyone clicks on one of them, they’ll get the full picture. In Tweetdeck, however, the pictures appear to simply follow one after the other.