Recently Apple acquired Topsy, a social search engine. While the future is unclear, it is pretty obvious that Apple, Facebook, and Google are all competitors in everything now. Remember when Google was primarily focused on its search? They seem to have neglected the social side, which Topsy covered, and now Apple has jumped in to take advantage of it.
Related articles: http://online.wsj.com/news/articles/SB10001424052702304854804579234450633315742
http://abcnews.go.com/Technology/apple-buys-topsy-twitter-search-tool/story?id=21075570
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