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It is so popular because it has a lot of useful features such as Cross-browser Compatibility, Fast & Small Footprint, Short Learning curve & Great Documentation, Tons of Plugins, CSS3 Selectors...

No Follow link are used to gain just traffic. Google does not crawl NoFollow links

I am using old techniques like social media websites such as delicious, stumbleupon, pinterest, facebook twitter etc. to promote websites

Can you please explain me how can we do this??

Yeah Ihave Window 7 in my computer. You must download adobe flash player to play videos in Firefox.

First of all please tell me what is your computer's operating system??
Then you can get exact solution of your problem from here recommended site

Here is a same principal can be applied to any link which is as follows:-

Website A > link > Website B

But if Website B doesn’t link back then the link from website A to B is a one way link.