Stamped is an iPhone app launched by a team of (mostly) former

Google Google LLC () is an American multinational technology company focusing on search engine technology, online advertising, cloud computing, computer software, quantum computing, e-commerce, artificial intelligence, and consumer electronics. ...

employees in November 2011 that keeps track and shares users' recommendations for restaurants, music, books, etc. on

social media Social media are interactive media technologies that facilitate the creation and sharing of information, ideas, interests, and other forms of expression through virtual communities and networks. While challenges to the definition of ''social medi ...

. Later, it was acquired by

Yahoo Yahoo! (, styled yahoo''!'' in its logo) is an American web services provider. It is headquartered in Sunnyvale, California and operated by the namesake company Yahoo! Inc. (2017–present), Yahoo Inc., which is 90% owned by investment funds ma ...

in an effort to bolster the company's mobile platform.

References

Mobile software American companies established in 2011 2012 mergers and acquisitions {{mobile-software-stub