Of the controversial opinion that a proper localization of Bocchi the Rock renders イソスタグラム as IVISTAGRAM, with the VI drawn in any logo such that it looks like И
the joke, of sorts, is that the real name of インスタグラム is just a single stroke different from BTR's non-infringing alternate name; even the actual account on the site for the anime is "btr_isosta"
I also feel like "ivista" is both just barely plausible an actual photo hosting website name