SocialBook Checker is a free Chrome add-on developed by SocialBook. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools program. With SocialBook Checker, users can conveniently access and analyze stats from any Instagram and YouTube page.

One of the key features of SocialBook Checker is the ability to send mass emails directly to YouTube and Instagram creators. This makes it easy to reach out to influencers and collaborate with them on various projects. The add-on also allows users to view detailed analytics for YouTube and Instagram while browsing these platforms.

In addition, SocialBook Checker enables users to email YouTube and Instagram creators directly, making communication seamless and efficient. Users can also add YouTube creators to a shortlist from the YouTube search results, making it easier to keep track of their favorite content creators.

Overall, SocialBook Checker provides valuable insights and tools for those interested in influencer marketing on YouTube and Instagram. With its real-time performance tracking, users can stay up to date with the latest trends and statistics in the influencer industry.