Promoted Tweets from Twitter are beginning to appear in Google's real-time search results today. This is the first time that Google has allowed any form of advertising from a service other than its AdWords network to appear in its results.
Promoted tweets are regular tweets that businesses or organizations can pay to give prominent position in its Trends area and above other tweets in Twitter searches on that topic.
Twitter and Google are splitting revenues 50/50.
Search Engine Land broke the story, and provided a screenshot of what the Promoted Tweets will look like:
Google said this update is rolling out throughout today and should be live for everyone by tomorrow.