:teehee: For 2x2 or wider flat ribbing I (almost) always twist the first purl in each section. On the back I twist the first purl and knit into the back of the twisted stitches.
For knitting in the round I just always twist the first purl and since you don't knit on the back I don't untwist it. You can't see it on the front at all. On the back it looks twisted so I don't do this on say flipped up brims on hats.
It makes a tighter ribbing if you're prone to a loose ladder like spot in ribbing between the last knit and first purl.