
Pinterest is currently positioned second in the US market with a share of over 30%. This is followed by Reddit, Twitter, Instagram, and YouTube (see infographic).

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Pinterest is the social media platform of choice on tablets, while Reddit is one for desktop. In both devices, Facebook is a distant second. Twitter has around 6% market share in both.
Quite notably, May 2019 represents the first time Reddit has topped the charts on any device, signifying its increasing popularity among American users.

On a worldwide basis, Pinterest’s market share shrinks to just above 13%, while Reddit has only a modest 3.2%. Clearly, both the platforms are not as popular in the rest of the world like the US. Worldwide, Facebook dominates with a 70% market share.
In China, despite censorship and blockage in many areas, Facebook edges past Pinterest as the most popular social media platform. As on May 2019, Facebook had a market share of 32.3%, followed by Pinterest (27.8%), Twitter (24.1), Youku (6.6%), YouTube (2.5%) and Reddit (1.4%).
However, it may be noted that the scene in China is highly volatile with market equations changing rapidly in small time frames.