Twitters real time search results disappeared from Google back in July as their previous deal had run out and the two companies were unable to reach an agreement on the new deal.
Microsoft also had an agreement with Twitter for real time search results in its Bing search engine, and unlike Google it would appear that Microsoft has been able to come to a new agreement with Twitter.
The two companies announced the new deal on Twitter,
and whilst no details of the deal have been revealed, the original deal
ran for around two years so they could have signed a new two year deal
which will include Twitter results in Bing.