San Francisco-based Twitter has acquired mobile bug-fighter Crashlytics, but unlike many of its other acquisitions, Twitter plans to keep the Cambridge-based team in place and independent. Here’s why the start-up is a great fit for the mother nest, and what it might tell us about Twitter’s strategy down the road.

Given Twitter’s early history, where it was as well known for its Fail Whale as it was for its ability to connect people through 140 characters, it’s easy to understand the company’s strong interest in making sure its big mobile push scales up more smoothly than its early Web efforts.