Silly question, but what do blue checkmarks mean here on Mastodon?
@gwensnyder That you've linked your profile to your website.
@MajorBedhead @gwensnyder what you're talking about is something different than the question asked I think, i.e., URLs in profiles with check marks next to the link. And yeah that means the website has a link back to your profile with the rel="me" attribute set, confirming it is actually a website that user controls.