When somebody is answering a question with a link it is often a 'bit.ly' link. Bit.lys are often very easy to type, eg.
However, to put a link in you have to add 'http://' before it for it to be recognized. This is time consuming and is even harder on mobiles. http://bit.ly/giffgaffagent - It takes over twice the amount of time to type!
As on twitter and facebook, I propose that links without http:// are 'hyperlinked' to increase the speed of answers and ease of creating links! I believe this can be possible as on other forums it is!