Fake Orkut Profile — a fake account has been craeted by my name

Respected sir,
i am Deepti. somebody has created a fake orkut account by my name. that account exists from past 8 months or so. this person is defaming me. this person has even posted obscene information about me and is also using my picture. please sir help me. i am in big trouble. my personal and professional lives are getting affected.i dont know the email id of that profile but the URL of that account/profile is as under:

http://www.orkut.co.in/Main#Profile?uid=[protected]


this person has my photos, if we are able to delete this, he will surely make it again. is there any solution to this??