Why do Facebook video posts take time before getting published?
Each video you post to FB is processed by the Facebook servers. Usually, it takes 20+ minutes to publish a 10Mb video.
Circleboom sends posts at the exact time a post owner sets during the post creation. While the text and photo posts are published immediately by Facebook, it takes more than 10 minutes for Facebook to process videos. You can speed up the processing time by uploading MP4 video files.