With additional apps, there are many in the market, do a search on "hide picture".

Without additional apps, within gallery, press option and u can choose to hide or show albums... albums can be individual folders where you store your pictures.

Hope this helps. 

QuickPic can hide a gallery folder (but not individual pics).  It can also require a password to show the hidden folders.  I think it creates a .nomedia file in the folders to be hidden, which the gallery app will not show.  BTW, QuickPic is a very fast and very capable gallery app replacement

hi all

i'm using samsung wonder.
i install Easy task killer to replace existing task manager function (sometimes i use the task manager too)
i manually kill background apps by using Easy very often. i notice that facebook app is always running, eventho i already kill it

is there any setting to prevent facebook app from running? i already always disable data network connection

thanks sifus