There are a few potential reasons why blue emojis are popular on social media platforms:
Emotional associations: Blue is often associated with calmness, tranquility, and stability, which can be appealing qualities to convey in online communication. The blue heart, for example, is commonly used to represent love, trust, and loyalty.
Visibility and contrast: Blue is a relatively bright and high-contrast color that stands out well against many backgrounds. This can make blue emojis more noticeable and eye-catching than other colors, which may help them gain popularity.
Design choices: Many social media platforms have blue-themed designs or logos, which can make blue emojis feel like a natural fit within those contexts. For example, Facebook's logo and design features a prominent blue color scheme, which may have contributed to the popularity of blue emojis on that platform.
Standardization: Emojis are standardized across different platforms, meaning that a blue heart on one platform will look the same as a blue heart on another platform. This consistency can help to establish a shared language of communication and may contribute to the popularity of certain emojis, including those that are blue.