Why does Twitter use a hash and exclamation mark in URLs, and how do they rewrite search URLs?

We understand the hash is for AJAX searches, but the exclamation mark? Anyone know?

Integrating FaceBook, Twitter, Social networks in Android

Integrating Multiple Social networks into Android with a single common Framework or API or JAR

How to improve my algorithm for analyzing twitters messages from users?

Hello I had a nice idea to implement, that may be a useful for the human kind. I call it

ShareKit - How can I know if one user already authorized my app on Twitter?

I have a app that send messages for Twitter. I'm writing a "view settings" and I'd like to know if the user already autorized my app on Twitter. I have the fields "username" and "password", how can I check if the user already authorized?

status box like twitter status box [closed]

I am a new PHP learner. I need a status box which just like twitter status box. I have tried many websites and i can not find the exact solution.