Please help me to develop my site?

[Sathish]

Am developing a site for educational purpose.. I need to add a widget which enable the user to answer question and validating their answers in online. Is there any Widget available anywhere for free of cost. If any please tel me..

[robust]

the best solution is use Facebook.
you can learn FQL (Facebook query language )
its very easy to learn and huge benefits specially when you need to put widget for commenting ,for commenter you can put condition to firs verify by your fb account which will also done by FQL
you can also use tweets .
or you can make word press blog for free commenting threads .
which language in which you developing your site?