From InfoWorld: Instagram hit a milestone this week, logging more than 400 million monthly users, solidly surpassing rival Twitter.
Instagram, a five-year-old site for posting and photos and video online, has claimed the No. 2 spot in the social networking world -- behind parent company Facebook.
"Given that Facebook owns Instagram, that certainly makes them the king of the social networking mountain," said Dan Olds, an analyst at The Gabriel Consulting Group. "Instagram is aimed squarely at mobile devices, and that makes it very easy for users to shoot and post very quickly. It also has the patina of 'cool' with hip users -- mainly arising from young users adopting it as their own."
Instagram is gaining momentum. In December of last year, the company said it reached the 300 million monthly user mark. Less than a year later, the site has added another 100 million active users.
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