While looking at bebo.com for ideas for social network features, I noticed they have on the front page they have a carousel style of vertical tab selection for their latest videos. I probably wouldn't have noticed the feature if I hadn't proposed vertical tabs for Node Forms in Drupal 7. The Carousel style of selection could be useful for selecting video galleries and photo albums and I think makes for a great user experience. To me, I find bebo has a much nicer user experience even though facebook has a lot more on offer.