ChangeTip is a micropayment platform built by ChangeCoin, Inc., an American corporation based in San Francisco, California, which specializes in online micropayments using the digital currency bitcoin. Founded in 2013, ChangeTip enables users of the digital currency to send micropayments across various social media websites, such as Twitter, YouTube, Reddit, and Facebook, as well as e-mail and text messaging. These micropayments, referred to as 'tips', are primarily used to express appreciation for quality content. As of January 31st, 2015, the average micropayment using the ChangeTip platform was a little over $1, with over $250,000 having been tipped since its inception.