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Mobile Minutes: Google Duo; Airbnb tests travel guides; Snapchat eyes Vurb; Twitter on Apple TV

The company launched a free new video calling service called Duo on Tuesday that's not unlike Apple's native video calling app. But it comes with a few bells and whistles to help the app stand out.

Airbnb Inc. is pressing ahead with plans to expand into new travel services including restaurant reservations and city tours, transforming the company from a single-minded home-rental service to a multipurpose trip planner.

Snapchat Inc. is in the process of acquiring personalized search app Vurb, according to people familiar with matter.

Twitter is thinking visual, and investors agree: Shares of Twitter surged 7% Monday following a report the social media service is readying a version of its app for the Apple TV set-top box.