They're really confusing as well

 I found a new thing on the internet to be annoyed by. 

On twitter, you can share links (of course) and you can write something about those links, and when you do, your comment appears first and then a preview of the link. When the link is an article, this is typically an image, the headline, and the sub-heading stuff. 

The process of you sharing this link is that you read it, you copy it into your tweet or click the share button to make it appear there, and then you write your comment about it before you tweet it. Therefore in your mind you've read the headline first and then your comment. But when someone else sees it, they see your comment first. 

This can be amusing, as in this tweet where the image (not of SpongeBob) doesn't match the comment about SpongeBob, which is just meant to give more information once you've got the main point of the headline below: 

The FUCK happened to SpongeBob?? pic.twitter.com/WrIIL7d0dA

— Zack Fox (@ZackFoxFilm) August 16, 2020

It can also lead to weird linguistic effects when the comment includes something that normally has to refer back to something else in the discourse. In this tweet, the comment refers to the discovery mentioned in the headline, and so tells us more about 'the molecule'. But because it comes first, we think 'what molecule?'. 

The molecule is based on a tiny antibody originally found in llamas, camels, and alpacas. https://t.co/YVMoc4d4PB

— VICE (@VICE) August 17, 2020

That's because the comes with a presupposition of existence and individuality; when you say the you're asking your conversation partner to accept that the thing exists, and that you both know which one you're talking about. If you've read the headline first, no problem - you've just been told it exists. If you haven't, as in the twitter format, you don't yet know it exists (you know some molecules exist, but you don't know the specific one under discussion here). 

Let's see another. This time, if you read the headline and blurb first, you can see they're asking for regular donations, and the comment tells you that you don't have to donate regularly if you can't afford it, you can also make a one-off donation. 

You can donate once too. https://t.co/3Kn4ZGTFQU

— Foolproof (Sylvia Suddes) (@bossproofreader) August 5, 2020

But if you read the comment first, you run up against two things: first it's pragmatically strange to read that you can donate once, as if there's a limit on how many donations you can make. Without the contrast with 'regular', we understand the meaning of once as 'once and once only' (that's some more pragmatics there). Then we get too and that needs to come after the first option, otherwise what's it as well as? 

Anyway, just a little quirk of the way the parts of the text are displayed, on this specific platform.