Squint Labs
Squint helps YouTube viewers quickly assess the truthfulness of statements made in YouTube videos. Squint searches multiple reliable sources (Google News, Wikipedia, etc.) for keywords extracted from the transcript of the video you're watching, and shows you the top results in a convenient sidebar, so that you can verify the accuracy of statements as soon as you hear them.
Squint also works with text-based inputs, so that the user can select an excerpt of text from a webpage and look for search results related to the content selected.