hey all friends..

i am a webmaster and want to know what is main benefits of social bookmarking?? and why we do???

Thanks..

There are many benefits both for Search engines point of view and humanbeings.
Below are just few benefits.

Search engine:
it will be counted as a back links to your site.
It aids your page rank
It help to give you better SE serp

Humanbeing:
It promotes your website to people
It enable people to visit your site easily.