SFV
SFV has 2 meanings
Short-form video
Those discussing social media content use SFV to mean "short-form video." An SFV is any video posted to social media that is 60 seconds or less in length. (Or at least, that's the generally-accepted definition. Some consider 90 seconds to be the cutoff length for SFVs.)
You're most likely to see influencers, social media marketers, and other metrics-obsessed users employ this acronym, while talking about audience engagement and social media trends. You may also encounter SFV in news articles, essays, and videos discussing the pros, cons, and current state of social media.
Example
I think SFVs are ruining our kids' attention span
I think they're giving our kids a break from this depressing world
Baseball Slang Quiz: Can you bat 1.000?
Gamers use SFV as shorthand for Street Fighter V. This popular entry in Capcom's Street Fighter fighting game franchise was released in 2016, for Windows and the PS4.
Like other Street Fighter games, SFV enjoys a healthy competitive and eSports scene, in which players face off for cash prizes. Thus, you may see discussion of SFV tournaments online. You may also see references to SFV's Arcade Edition and Champion Edition, which were re-releases that included polished features and additional content.