When you post a link to Tumblr, you get the green box, and an excerpt which Tumblr reads from the data on the original post I guess.
And if you delete the excerpt and write your own description and press post, does it just delete what you wrote? Or is that just a thing for me and I need to update something on my PC?
It’s happened a couple of times, depriving you of my golden insights on, er, an airport in Amsterdam and something else I can’t remember. But it’s the principle dammit.