Starting next month, the more than 400 million Facebook users could begin seeing a new kind of status update flow through their news feed: the current locations of their friends.
Facebook plans to take the wraps off a new location-based feature in late April at f8, the company’s yearly developer conference, according to several people briefed on the project, who spoke on condition of anonymity because they were not authorized to discuss unannounced services.
Not surprising, I suppose, since Facebook's competition already offer geo services. But, as you note, this is yet another vehicle that raises privacy issues. I guess as long as any geo updates are clearly opt-in and identified, this should be no worse than the host of other geo services.