Microsoft invested $240m in Facebook for a 1.6 per cent stake in the company in 2007, which saw it provide the banner ads on Facebook in international markets.
Facebook stopped using Microsoft banner ads in 2010 and instead expanded its use of Microsoft Bing search results.
However, a spokesperson confirmed to Reuters that it has now ended the search results agreement, saying: "We’re not currently showing web search results in Facebook Search because we’re focused on helping people find what’s been shared with them on Facebook. We continue to have a great partnership with Microsoft in lots of different areas.”
It comes after chief executive Mark Zuckerberg revealed in July that there were more than one billion search queries occurring on Facebook every day, signalling his intention to develop its search service.
"There is more than a trillion posts, which some of the search engineers on the team like to remind me, is bigger than any Web search corpus out there," he said at the time.
Earlier this week, Facebook promised publishers “better targeting” and “more intelligence” with the launch of a suite of tools to better monitise fans.
The tools a “Domain Insights” service which offers deeper URL-level reporting as well a feature that notifies publishers when other pages and influencers share their posts.
It accompanies "Interest Targeting” and “Post End Date” tools while a “Smart Publishing” product has been developed to help publishers understand how articles go viral on the platform.