The stories about people who found bugs in facebook , drive me to dig deeper than just facebooking. There is a way to access locked profile picture (current one), or those are privacy protected.
In a previous post , i mentioned about right clicking on sites which denied the right click. This may not be a geeky thing, but CTRL+SHIFT+RIGHT_CLICK will provide you the right click, in restricted pages. So you have the pop-up menu eluded browser, click on open image in new window. Have a closer look on URL in address bar. The url may look like, https://fbcdn-profile-a.akamaihd.net/hprofile-ak-xfp1/v/t1.0-1/c170.50.621.621/s160x160/*_n.jpg. Lets remove some portion of the URL “/v/t1.0-1/c170.50.621.621/s160x160”, after removing that portion URL will look like “https://fbcdn-profile-a.akamaihd.net/hprofile-ak-xfp1/*_n.jpg” ,press ENTER. 🙂
Free as in freedom...!!! 
