1.Check all the buttons or menu working properly in the
application or website.
2.Check social booking marking functionality is working
correctly
3.Check all other elements like above.

these are the list of some test cases for your scenario...
(to write test cases, I considered that the elements 
are "Links")

1.Check "Social BookMarking" link
2.Click "Post a comment" and see whether it prompts options 
(i)to add a comment (ii)edit coment, (iii)post comment (iv) 
cancel
3.Check whethear the posted comment is appearing or not
4.Check the "number of views"
5.check "existing rating"
6.Checking "Rate this"
(i) click on "rate this" and add your rating.
(ii) check wheather the new rating is updated or not
7.Checking "Add to favo"
(i) click on "add to fav"
(ii)check wheather the application represents any 
background process indicators while adding...
(iii)check wheather the contents of your 'favorites' is 
increased or not
8.check "track this"
9.check "print this"
10.check "guess who"
-----------
Hi selva note this:
1) the above scenarios are based on the assumptions of the 
funtionalities of elements.
2) I don't know the functionalities of the 
elements "Bookmarking", "track this", and Guess who" and 
hence their scenarios are as per your requirements...


I hope that this may help u lot...

Bye 

Yours: vijayabhaskar83@sifymail.com