Microsoft is currently experimenting with Bing and showing individual tweets within in the search results, and here is proof of the test. Redmond is playing catch up to Google with this feature, with Google Search showing tweets within results from last year.
Microsoft's Bing test was discovered by Rubén Gómez of All Google Testing, showing that the company is looking to bring the feature to Google Chrome, Mozilla Firefox, and Microsoft's own Internet Explorer.
Interestingly Microsoft's newer Edge browser isn't getting the experiment, but if Microsoft makes individual tweets searchable, we imagine Edge will get the feature.
For those interested, the experiment can be reproduced by doing the following (worked in Chrome and IE, not Firefox):
Go to Bing and load your browser's developer console:
Google Chrome: Tools, Developer Tools
Mozilla Firefox: Web Developer, Web Console
Internet Explorer: Developer Tools (F12), Console
Copy and paste the following code: 09A74265B87C629633194B6AB944635B
Press Enter and you'll see the experiment.
If doesn't work, try this other method:
Open Chrome and install this extension.
Go to Bing and select “Edit Cookies” option on the context menu:
Find the cookies named MUIDB and MUID, and replace the value with this cookie value: 09A74265B87C629633194B6AB944635B
Microsoft's Bing team has worked closely with Twitter before, first starting a collaboration in 2009 and then again in 2013, allowing users to see tweets in search results. It is worth mentioning that Microsoft, or indeed Twitter, has not officially announced this test but considering it's something that can be duplicated, it is certainly the real deal.