Raptr: 2008 — September 2017

Capital raised: $44 million
Peak valuation: $170 million

Raptr folded in September after nearly a decade as the go-to social network for gamers. Its service helped them keep track of which games their friends were playing and made it easier for them to remotely play multiperson games.

Though Raptr expanded its offerings to include game optimization, the company outlasted its usefulness as more gaming companies offered similar services. Its fate was sealed in 2016, after the company lost a key partnership with chipmaker AMD, which stopped bundling Raptr's app with its graphics software.