Facebook continues its efforts to evolve from a mere social networking site into a content and...

|By:, SA News Editor

Facebook continues its efforts to evolve from a mere social networking site into a content and entertainment hub: The company is introducing a "Subscribe" button that can be embedded into third-party sites, and allow those sites to deliver content to a Facebook user's feed. To some extent, the move represents a shot across Twitter's bow, as well as a challenge to Google Reader (GOOG) and Google+.