The Verge on WP7

Unlike on Android or iOS, the mobile version of the Verge doesn't allow swiping of the 5 top story tiles at the top (you can still cycle through the stories by hitting the dots). Is this due to limitations of the Mango browser (IE9)? I know from using a webOS phone previously that its browser didn't support "Swipe Events" needed to enable these types of commands. Very disappointing.