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Thanks everyone, I knew I'd get a sensible answer here.

Does shift-enter or ctrl-enter behave differently?

Ctrl + Carriage Return.

You think that's odd then try formatting something with Tabs!

Press Crtl and Return at the same time for a line return without posting.

Shift+Enter is your friend.

I don't venture into there, but sadly (as my family use it) I have to use the similar/same crap editor in What'sapp. I go into curmudgeon mode every time I'm obliged to use it.

CTRL + Enter and Shift + Enter are the usual suspects. Note that in some web forms you can format text in an local editor and then paste in the words. That will also sometimes retain the paragraph breaks.

It's the same on whatsapp. There CTRL CR works instead of just CR

Or you can use a browser extension like "Edit with Sublime Text" that allows you to simply click on the text entry with the right mouse button and gives you a menu that allows you to edit the text locally with an editor of your choice (not just Sublime). On saving the text in the editor it gets put back into the text box automatically.

I use this on Linux with an editor called vile (a vi clone, like vim) which I use for absolutely everything so I'm very familiar with it.

You may not be able to enter some characters in its editor. I encounter this on nextdoor.com as well, which is a bit of a mess at the best of times, looking like its been designed by 20 programmers not talking to each other.. Brian