If I tweet a link Twitter automatically picks a picture it embeds into that tweet. Is there some way to point out to Twitter (and perhaps also all the other social media sites Facebook, Instagram, ...) what picture to pick? Especially when you not integrate the typical set of social media buttons offering to post about the page, but if someone just posts a link to say a blog article? Is that perhaps simply the biggest picture detected to come from the same origin?
And if there is such a mechanism, can you even tell twitter to rather not display some picture, especially with a webpage not so well known and mostly textual, where the most prominent picture rather is a site logo only?
As one example I see links to Quora answers having pictures not even part of that answer as if there is some hidden tag or meta info as an official way to tell social media what picture to embed. If there is, how does this work generally? When something applies to Twitter, does it also apply to Twitter apps like HootSuite?
That's a bit fuzzy question, but I'd take any helpful hint on social media optimization. Is that a thing at all, aside from SEO?