A great sample application which showcases a state-of-the-art parsing engine.

The main question is : Why should I use your micro-blogging engine instead of the other ones? The README is unclear about it.

> Birdy is the main application described in detail in the O'Reilly Opa Book.

To learn more about Opa.

That's indeed the best answer.

Another one is that, Opa should provide by default a pretty good level of security, being immune to XSS attacks and database injections.

Edit: looking at alternatives, it might also be one the cleanest...