It means non breakable space. It just means a space and I think it's something to with keeping words on the same line, so for example in your post, you could put one between "groups always" and it would keep it on the same line.

Oh...yeah....right.....er....duh, run that by me a bit slower squarebear.

sounds a bit like the gubbins that sometimes appears in AB questions when you think you've typed a double-quote mark

Yes, a non-breaking space (sometimes called a 'hard space') is used between words that you want to keep together on the same line and not get separated by wordwrap at the end of a line. In most word processors you enter a non-breaking space by pressing ctrl-space.

In HTML code it is an ampersand & followed by nbsp.

To answer peppermum's question, posts to bulletin boards/forums often allow the user to define a 'signature' that appears at the end of every post. Your friend must have tried to do that and has pressed ctrl-space as (part of) her signature. She can cure it by going into her profile and editing her signature and delete whatever is there and retype it without the hard space.

Say you wanted "groups" and "always" on the same line of your original post. See how they are on two different lines? Well if you write "groups & nbsp ; always", they will appear on the same line.

Is that any clearer?