Disney has announced an agreement to purchase popular YouTube multi-channel network Maker Studios for $500 million plus as much as $450 million in additional performance-based compensation. Maker Studios boasts 380 million subscribers and 5.5 billion views per month across 55,000 channels. Notable channels on the network include PewDiePie, ‘Epic Rap Battles of History,’ and Mike Tompkins. This is a developing story. Please refresh for updates. Thumbnail credit:_Thomas Samson / AFP / _Getty Images