Recently i have seen that most of my friends at Facebook are getting annoying & obscene wall posts in the form of Spam
Here is the trict to stop it:
1) Go to the top right corner on your Facebook profile page, click it to open the menu like this:
2) Click on Privacy Settings and find the setting ''How you connect''. Hit the edit settings as shown below:
3) A menu will pop up like the one below. Set who can post on your timeline as ''Only Me''. Click on Done.
4) Hurray!!! No more spam to bother you anymore...Enjoy & Share This Info with your FB Friends