BuzzSumo is a content marketing intelligence platform founded in 2014 by Henley Wing and James Blackwell, focused on surfacing the most-shared content and the most-influential creators around any given topic, brand, domain, or keyword.
The core product indexes social-engagement data across major platforms (with Facebook and X providing tighter and looser visibility over time as their APIs have evolved), allowing marketers, PR teams, and content strategists to research topic landscapes, monitor competitor content performance, identify journalists and influencers writing on a beat, and surface trending stories in real time. BuzzSumo was acquired by social-listening company Brandwatch in 2017 for a reported £18 million; Brandwatch was subsequently acquired by Cision in 2021, placing BuzzSumo inside the larger Cision PR and content-intelligence stack while continuing to operate as a standalone product brand.