why women shouldnt post their photos in facebook or any other social networking sites

ok , now 10 years ago if i had asked this question to anyone ,  the answer would have been simple.
It is not allowed because people may download the photos  or the "fb people " may use it for other purposes. this would have been our innocent reply
            but this is not 10years ago. presently we live in a age where we comment on any photos .We trust facebook more than our parents.(how else can we explain the photos in our profile which our parents haven't even seen) .so lets get into the details  
It is not allowed because
1.THE WHOLE WORLD IS WATCHING 

           The numerous photos and albums that we post on fb is being viewed by the whole world .There is no point denying it .At least our profile pic  is being viewed by the world. Again, we trust facebook that they don't reveal the other photos to third parties.Facebook is  very insecure.Remember ,when we use different applications in facebook , they ask us for permission to access all our private data .These are third parties and we blindly check the box .Hackers can easily access  our photos and there is no question what they will do with them in this psycho world.
The second one is for people who say that they have "privatised" the viewership of their photos
2.ARE ALL OUR  FRIENDS TRUSTWORTHY?
 Now lets assume you have 400 friends
 20 of them are your meher(i know i am bit generous , because your cousins are not your meher)  
 That leaves you with 380, out of which we can again assume 300 are girls
  Which leaves us with 80 men . they consist of

•  your friends in schools
• your cousins and relatives
• total unknowns 

Now all three are equally dangerous.All three are not allowed to view your photos or look (observe) at you.
So even if you argue that  "i don't have any unknowns" , the other two category remains .
3 TAKING PHOTOS ITSELF IS HARAM

Now , this is applied to both men and women   
This is also one thing which most people cant accept. (because taking photos has been well ingrained in the society)
lets see what the exceptions are
taking photos  is allowed  for

•  passports 
• applying for jobs
• identifying suspects 
• for making certificates and driving licenses etc

So taking photos in marriage parties  is haram.

people may argue that it is only made for  memories

but by taking photos , we are trying to match the creation of god 

also narrated that the Prophet (peace and blessings of Allaah be upon him) said: “Every image-maker will be in the Fire, and every image that he made will be made to appear to him and will torment him in Hell.”

This i sufficient proof that taking  photos is haram 

and it becomes even worse when it is for trivial things like posting on facebook