How do I enable comments and likes on my Facebook posts?

[Nicholas]

I seem to have switched off the ability for friends to like or comment on photos and statuses that i post myself on my timeline, even though they can see them, and the audience is set to Friends.

Except my profile picture (which is set to public) - they seem to be able to like and comment on that only.

Thanks!

[Suraj]

goto setting on facebook then privacy setting and change there who can comment and like on your post : make it as everyone or public : just it