Instagram is hoping the photo-sharing service's new tagging feature called "Photos of You" appeals to businesses by allowing users to tag posts with brand names, the company said in a blog post. This new ability for fans to tag brands in photos of products is more than just free word-of-mouth marketing, writes Chris Gayomali. The tags also allow businesses to see who is buying their products, where they're being used and what sort of feedback the posts get from followers.

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