A few weeks ago, Yahoo! added Twitter to their News Shortcut. Now, Yahoo! is adding Twitter updates directly to their search results. Expect to see them for "buzzy" topics.
When Yahoo! detects a hot topic being queried on their search engine, their algorithm will select Tweets to present in the results.
When Tweets do appear, they'll usually be placed at the bottom of the results.

Image via Yahoo! search blog
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