You are trying to study for your midsem. You open the course pdf. Then you say to yourself "Damn i don't know even the basics". Then you open wikipedia. You try to read it. Alas you find it all boring. But just to give it an another try, you click on some link in "see also" and after that you jump from link to link and find something interesting.

You google about it. You find really interesting web pages, videos and many other stuffs on it. Then you set some of that stuff as your status message in gtalk, post some related links on facebook and tweet about it on twitter. If you still think your friends are not fully aware of what's going on your mind, you also write a blog on the same. While writing this blog you have opened a few related videos on youtube for buffering. So once the blogging is complete, you view those videos. And after that you jump from one video to another on youtube

After doing all this for hours you realise that you haven't read a single page of your course pdf. And you say "Damn I'm stuck again in internet loop of videos, wiki n interesting stuffs. I'll get this pdf printed."