Yanbu, bluebelle. I'm supporting your request. It doesn't have to be an "always active" edit facility, HQ. The comments section of the Times online (not the app, but the browser editions), for example, allows edits to posted comments for up to five minutes after the original is posted. This means that reading back over one's post, one has time to see typos that you previously missed, or to rephrase something.
I realise GN tech runs on a shoestring, but still..... You meed to catch up a bit.
Oh, and please tell Mumsnet that their Twitter gifs are really annoying. Most of them are naff in any case.