Seriously, if 'thissing' is meant to be like Facebook why do I have to refresh the entire page when I apply it? Why in fact do I still have to wait for a page refresh after replying to a post too? Or after logging on?
I realise there are some downsides to AJAXing these things, such as not realising there are replies there between you starting to reply and posting but it makes the site really slow. However, I can't see any downside to Thissing using AJAX.