How pinch to zoom in iPhone 4S in Facebook in mobile version?

I mean its not "Facebook" app IIm in net surfing in facebooks mobile version

Try three fingers tapnac screen twice. You probably have enabled the visually impaired.

I don't think you could zoom in using either the app or mobile version of Facebook.

Lol…
Place your thumb and index fingure together on screen and then grab them apart ( grab away from each other).By this you can zoom a page while surfing
This is not called pich…
Pinch is oppsite of it.
pinch makes your page smaller (reduce zoom)
. For pich, place your thumb and index fingure together on screen but apart certain distance. Then grab them near.
The page will be zoom out.

Ask from the friend from which you borrowed. He must know about that