@NervousGamedev right but that would need to be in a machine-readable, consistent format across all of these websites. If Instagram changes where someone's bio is stored (or even just the HTML in which it is structured or the API calls needed to get that info) then everything breaks.
@darius i think it'd still be worthwhile to maintain that for each supported social media site as they update. simple enough to detect a breaking change like you describe unless the site is deliberately trying to sabotage it. major social media sites have reliable APIs you can use to directly query the data fields we're talking about so you wouldn't even need to use HTML to verify in the first place.