Little secret of Facebook short videos
The short videos on Facebook will only repeat the first three seconds. Have you noticed?
Everyone operating social media aims to attract readers' attention and achieve a high click-through rate and view count. Facebook devised a new marketing strategy for this.
Many people think that Facebook has slowly declined, and its users are gradually decreasing, but many people still use it for business purposes.
After Facebook bought Instagram for $1 billion, posts on both sides can be published simultaneously, short videos as well.

When people are watching Facebook, they used to be able to stay in the place where the short video was and watch the entire short video without clicking in.
To let people click in to watch a short video and automatically play the following video. Facebook designed the short video only to protect the first three seconds. It means that when people accidentally slide over the short video and do not want to click in, they just want to stop and watch it for a short time, but they cannot watch the whole video without clicking in now.

Facebook uses this little revision to make people click on short videos and arouse people's curiosity, and then it is easy to cause people to watch the following video automatically.
This approach increases the number of views of short videos and lets more people see the creator's videos. Instead of stopping scrolling and watching a video, people need to click on it and automatically watch other videos.