Does anyone use gravatar?
The benefits of Gravatar can be found in the “globally recognized” purpose of the service. Alongside WordPress accounts, it's used by a variety of different sites across the globe, including Slack, Atlassian (owner of Jira and Trello), GitHub, Stack Overflow, Disqus and more.
What is gravatar used for?
What is Gravatar? Gravatar stands for Globally Recognized Avatar. This web service lets users upload an online avatar and will associate the avatar with their email address.
What are the dimensions of a Facebook post?
Facebook timeline photo and post sizes:
Recommended size: 1200 x 630 pixels. Minimum size: 600 x 315 pixels.