Cloudflare Browser Insights is a tool that measures the performance of websites from the perspective of users.
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Libravatar is a service for fetching avatar images for e-mail addresses and OpenIDs in a privacy respecting way.
Open Graph is a protocol that is used to integrate any web page into the social graph.