you can do that by joining and posting your thoughts on same thematic groups in facebook, join groups, start polling, and if you want more than this you can create facebook paid ads.

hope this helps

[QUOTE=Karthik_pranas;1540253]hi Frendz,
What are the uses of captcha in registration form?[/QUOTE]

Captcha is very useful to prevent automated submission's by various available tools on internet.

Wordtracker is a keyword suggestion tools for SEO, SEM, PPC. It helps search engine professionals to find out and research what peoples actually search on search engines.