This is a possible summary:
Markiplier reacts to his old videos and comments on how they show his growth, mistakes, and achievements as a YouTuber. He watches videos where he tries to be scary, funny, manly, or informative, and laughs at his awkwardness, enthusiasm, and creativity. He expresses his gratitude to his fans and his love for making videos. He also hints at some future plans and projects.
Here are the key facts extracted from the text:
1. The video is a reaction video by Markiplier, where he watches and comments on his old videos.
2. Markiplier's current age is not mentioned, but he mentions being 23 years old in one of his old videos.
3. Markiplier's first video is not shown in this reaction video, but he mentions that it is available in his vlog playlist.
4. Markiplier's first vlog was uploaded when he was 23 years old.
5. Markiplier used to make videos on YouTube to promote his live streams on Twitch.
6. Markiplier's notification system on YouTube was not very good in the past.
7. Markiplier had a P.O. Box where he received fan mail and gifts before it became too much to handle.
8. Markiplier's video "Don't Blink" was the precursor to his "Don't Move" video.
9. Markiplier's first sketch was "The Fall of Slenderman," which was also the birth of his character Warfstache.
10. Markiplier's video "The Slender Man" is mentioned, but not shown in this reaction video.
11. Markiplier's video "Super Juice" is a 10-minute video where he repeats the phrase "Super Juice" multiple times.
12. Markiplier's video "RÖKNING FÖRBJUDEN" is a Swedish phrase that translates to "Smoking Forbidden."