Hi guys i found the solution
If you are Teen between age of 13 to 17 then you can't change your privacy settings, its a update from Orkut
If you created your account recently and your age is between 13 to 17 your consider as teen and you will be restricted to change your privacy options
by your own and even for teens safety filter is kept on you can't change it
Note: when some one try to add you as friend he /she must know your email id or else they can't add you as friend..
Help received from Ajay of orkut Help
thanks to M@crosoft and mrintech
Privacy settings
* Teenage user profiles will not appear in search results within orkut, even by searching their email address, and will not be visible in Google.com web search results.
* Teens do not have the option to share their content with everyone on orkut. They can still share content with individual friends, all friends or friends of friends. The default setting is friends only.
* Teenage users cannot make any profile field information public.
Safety Filter
* The Safety Filter feature is always on for teenage users.
* A teenage user will not be able to access mature content as identified by the Safety Filter.
* If another user is marked as unsafe by the orkut team, then all friend links to teenage users will be removed automatically.
Friend requests and friend suggestions
* To send a friend request to a teenage user, one needs to know the email address of that user.
* If another user is marked as unsafe by the orkut team, he will not be able to send friend requests to a teenage users, even if he knows their email addresses.
* Unsafe users will not be shown as friend suggestions to any orkut user.
Ads
* Teens and parents shouldn't worry with adult ads -- orkut will always display only ads classified as family-safe.