When I try to paste text from various other sources into my G2G posts, they often come out with text too large, or too tiny, etc., and the more I try to manipulate them, the worse they look. Now, thanks to Melanie Paul, I've learned to use the icon from the second row of the toolbar that looks like an italic "T" with a subscript "x." All you need to do is highlight your pasted text and click that icon, and it converts your text to the usual font and size. Works like a charm!
From what I see occasionally on G2G, I'm not the only one who could use this tip.