February 29 only appears on the calendar every four years, and the 2012 edition may include Facebook’s official announcement on timeline for pages. A source told Business Insider that the social network may use its invitation-only Facebook Marketing Conference that day to make the announcement, saying: At Facebook, they pushed back the launch of timeline for brands to the end of February. Those two pieces of information are too much of a coincidence. Another source told Business Insider: Timeline is coming to brand pages. Most people don’t even know.