The summary is:
The video is about a YouTube user who tries to find conspiracy theory videos by following the suggested videos on the site. He starts from a video about metalworking and ends up watching videos about strange inventions, life hacks, ancient civilizations, and UFOs. He comments on the videos he watches and makes jokes about them. He also questions how YouTube's algorithm works and why it recommends certain videos to him. He says that YouTube is a great platform for diverse content, but also has some problems with misinformation and clickbait. He asks his viewers to share their experiences of going down YouTube rabbit holes and thanks them for watching.
Here are some key facts extracted from the text:
1. The text is a transcript of a YouTube video by Markiplier, where he explores the YouTube algorithm and tries to find conspiracy theory videos.
2. The video is called "How Deep Does the Rabbit Hole Go?" and it was uploaded on November 29, 2017.
3. Markiplier starts from the homepage of YouTube in an incognito window and clicks on videos that catch his eye, without using the search function or the sidebar.
4. He counts how many videos it takes to get to a conspiracy theory video, and he defines it as a video that claims something that is not supported by evidence or mainstream science.
5. He finds a conspiracy theory video about the Bermuda Triangle after clicking on five videos, starting from a video about hammer forging.
6. He continues to explore other conspiracy theory videos about ancient civilizations, aliens, NASA, and Antarctica.
7. He comments on the absurdity, clickbait, and misinformation of some of the videos he encounters, and he questions the logic and evidence behind them.
8. He also notices that YouTube suggests videos in different languages and topics that are not related to his previous choices, indicating that the algorithm is confused by his behavior.
9. He concludes that YouTube is a great platform for creativity and diversity, but also a challenge for finding relevant and reliable content.