WordPress.org gets at least some Markdown http://www.wpbeginner.com/news/whats-coming-in-wordpress-4-3-features-and-screenshots WordPress.com has the whole thing https://en.support.wordpress.com/markdown
Today I'm using http://www.beginwithjava.com to learn the language #java
Yes, #COBOL now works with Node.js http://arstechnica.com/information-technology/2015/08/calling-1959-from-your-web-code-a-cobol-bridge-for-node-js