This function extension creates:
- Structured data (JSON-LD - JavaScript Object Notation for Linked Data) mainly for Google corresponding to schema.org to optimize SERP snippets (SERP = Search Engine Results Page).
- The Open Graph tags for social media services (Facebook, XING, LinkedIn etc.) corresponding to the Open Graph Protocol, also Google+ works very well with it.
- And tags for Twitter Card corresponding to developer.twitter.com.