: In some online circles, users post short video clips labeled as "useful" ironically or as a way to "save" a thread with a specific reaction video.
: Forums for software like vMix often have threads where users thank each other for a "useful post" regarding video codecs or MP4 recording settings. tsunl_9.mp4
If you are seeing this on a social platform or forum, it likely refers to one of the following: : In some online circles, users post short
: "tsunl" might be an abbreviation for a specific game, software, or user (e.g., "Tsun" is a common prefix in anime-related gaming communities). The "_9" would indicate it is the ninth in a series of resources. The "_9" would indicate it is the ninth
: Bots on Reddit often generate links to .mp4 files and users frequently comment "this is a useful post" in response to helpful automated links.