Activity on Quora, such as asking questions, adding or upvoting answers, submitting posts, and adding comments have been added into Google's Realtime search results. Gowalla, Plixi, Me2day, Twitgoo, have also been added, and was first reported in this Quora post.
It seems the addition of Quora happened yesterday afternoon, based on the above screenshot. Quora's co-founder Adam D'Angelo and CFO Marc Bodnick both voted up the Quora post on this subject.
Google Realtime search also includes updates from Twitter, Facebook, MySpace, Google Buzz, FriendFeed, Jaiku, Identi.ca, and TwitArmy, as well as news and blog post links.