why don't you give us bookmarking option here
 

Guys I do not understand

when vbulletin does not have bookmarking option

for example when ever I find an important post I want to book mark it here
so that I can have access that

not browser bookmark.

Also need a mod like this for my forum

Is there one?

You can always Subscribe to the Thread.

thanks subscribing sends me email. being notified of reply is not my intention
I want to have a space here in my user cp to have a list of all book marks
Do you know any mod available here?

thanks

You cannot apply mods here.

The feature you are talking about i.e. adding links to social bookmarking sites is a default feature of vB 3.7.x. There's currently no such option here.

That is something entirely different...

I did a few searches but haven't been able to pull anything. If you use subscribed threads you can turn off the email notification in your UserCP.