The world’s largest travel site has just acquired an app that, at first blush, has little to do with travel. The travel site in question is none other than TripAdvisor, and the supposedly non-travel app is Tiny Post.

The acquisition, whose terms are undisclosed, was announced by TripAdvisor cofounder and CEO Steve Kaufer. As part of the deal, the Tiny Post team will be based in TripAdvisor’s office in Palo Alto, California.

“The Tiny Post team have created a wonderful app that shows the possibilities of combining travel photos with social and mobile,” Kaufer said. “We think Tiny Post is a great fit with our continued drive to provide engaging and sharable content and I am happy to welcome this strong team to TripAdvisor.”

Kaufer also shared the news on Twitter and, quite fittingly, on Tiny Post itself using the above image.

Tiny Post

Apparently, in acquiring Tiny Post, TripAdvisor hopes to encourage users to share stories about their trips using the app.

Tiny Post is an app that lets users write captions over photos preferably to tell stories related to the photos.

The app was actually launched in November 2011 as Tiny Review, enabling users to review stuff by writing captions over photos.

But it eventually became a platform for users to post — and not strictly review — stuff by writing captions over photos. So, it made sense for the app to be rebranded as Tiny Post, which was exactly what happened in July last year.

Optimized for iPhone and iPod touch, Tiny Post is available in the App Store for free.