Tinder has just closed its first acquisition. The IAC-backed startup has purchased Chill, creators of Tappy, as part of a strategic acquihire. The terms of the deal were not disclosed. Tappy is a mobile messenger that uses photos and ephemerality to put a new face on text messaging. All messages disappear after 24 hours, and Tappy’s conversations must begin with a photo. From there, you can turn that particular photo into a chat thread, with a single individual or a group. [Source: Techcrunch.com]