First, we're excited to introduce social gadgets for iGoogle. Social gadgets let you share, collaborate and play games with your friends on top of all the things you can already do on your homepage. The 19 social gadgets we're debuting today offer many new ways to make your homepage more useful and fun. If you're a gaming fanatic, compete with others in Who has the biggest brain? or challenge your fellow Chess or Scrabble enthusiasts to a quick match. Stay tuned in to the latest buzz with media-sharing gadgets from NPR, The Huffington Post, and YouTube. To manage your day-to-day more efficiently, check things off alongside your friends with the social To-Do list gadget.

Source: Official Google Blog: I scream, you scream, we all scream for iGoogle social!