I am only 25 so I didn't know about zephygram. How is it different to email or twitter? (This is the only "valuable" page I found: http://the-tech.mit.edu/abou

I am only 25 so I didn't know about zephygram. How is it different to email or twitter? (This is the only "valuable" page I found: http://the-tech.mit.edu/about/old/zwrite.html http://the-tech.mit.edu/about/old/zwrite.html)