PTI pages were hacked last Friday, 3rd February 2012, and all the pages were closed. PTI supporters were enraged over this act of cowardliness and were very angry. Basically an Admin account of the pages were compromised and using that account the so called hacker closed the pages.
ISF team contacted Facebook officials and after some days of negotiations, they were able to get back the pages today. Only one page PTI Official is still missing, rest of the pages are restored and open again for PTI fans to communicate.