The page showing the list of users following a particular user includes a 'More' button even when there aren't additional users who are following that user. I think this only happens when there are exactly 20 users following. If less, then the 'More' button doesn't seem to show. This is generating a handful of alerts in Google Webmaster Tools of 'Soft 404 errors'. Here's an example: Members Accidental is Following | theMouthPiece.com Brass Band Forum - when you click the 'More' button at the bottom, you get what Google interprets as a 'Soft 404'.