An interesting new article predicts that Instagram users are beginning to use the site as a social news service instead of just for photo sharing. This would potentially make Instagram a serious threat to Twitter, which has hitherto managed to dominate the social-news niche. Instagram is easier to use than Twitter, but remains harder to search for or categorize information, something the company is well aware of and working on. Cofounder Mike Krieger tells users to expect improvements in searches in 2015.