Have you noticed the many tools to share your location? There's FourSquare and Gowalla, both about a year old. Then there are old-timers like Brightkite. And now, there's one that works with all three (and a couple more).
Facebook's Mark Zuckerberg has announced a new acquisition. The team behind Instagram will now be part of Facebook. The most compelling piece of Zuckerberg's post declares that Instagram will remain an independent product, which is good news for the Instagram API.