Twitter has a lot going on, and it’s not always easy to manage that kind of scale on your own. Today, Amazon announced that Twitter has signed a multi-year agreement with AWS to run its real-time timelines. It’s a major win for Amazon’s cloud arm.

While the companies have worked together in some capacity for over a decade, this marks the first time that Twitter is tapping AWS to help run its core timelines.

“This expansion onto AWS marks the first time that Twitter is leveraging the public cloud to scale their real-time service. Twitter will rely on the breadth and depth of AWS, including capabilities in compute, containers, storage and security, to reliably deliver the real-time service with the lowest latency, while continuing to develop and deploy new features to improve how people use Twitter,” the company explained in the announcement.

Parag Agrawal, chief technology officer at Twitter, sees this as a way to expand and improve the company’s real-time offerings by taking advantage of AWS’s network of data centers to deliver content closer to the user. “The collaboration with AWS will improve performance for people who use Twitter by enabling us to serve Tweets from data centers closer to our customers at the same time as we leverage the Arm-based architecture of AWS Graviton2 instances. In addition to helping us scale our infrastructure, this work with AWS enables us to ship features faster as we apply AWS’s diverse and growing portfolio of services,” Agrawal said in a statement.

It’s worth noting that Twitter also has a relationship with Google Cloud. In 2018, it announced it was moving its Hadoop clusters to GCP.

This announcement could be considered a case of the rich getting richer as AWS is the leader in the cloud infrastructure market by far, with around 33% market share. Microsoft is in second with around 18% and Google is in third with 9%, according to Synergy Research. In its most recent earnings report, Amazon reported $11.6 billion in AWS revenue, putting it on a run rate of over $46 billion.