Spindle, the company specializing in social search, has been purchased by Twitter.

While the app is only available in select cities, they are “building the discovery engine for the social web.” The company posted this short statement:

By joining forces with Twitter, we can do so much more to help you find interesting, timely, and useful information about what’s happening around you. The Spindle team will be relocating and joining the Twitter team in San Francisco. As part of this change, we’ll be sunsetting the Spindle service today to focus on these new and exciting opportunities. To our users, friends, families, investors, advisors, and everyone else: thank you for your support. It’s been an incredible journey and we couldn’t have gotten here without you.