Whose facebook profile is associated with this mobile number?

Now-a-days , as Facebook has become an immensely popular social networking site , I suppose almost 80% of the world population must be using Facebook(pardon me if  I am too much) particularly among the youngsters. Facebook can be access from almost any mobile with basic gprs facility. At the same time Mobile phone is also another thing which young people cannot stay a sec without it. People become so indebted with social networking sites that they cannot stay without login it every minute, every hour. It becomes indispensable , thus making a part of life.
 

Facebook makes it easy registration even from a "basic gprs enabled handset" with few registration details along with a mobile number . It gives a hassle-free to sign up even without an email ID. Thus most people used this way of signing up to Facebook(Particularly youngsters) .
 

And even if one would have sign up providing email IDs, there is a chance that they surely add their mobile number in their profile information... In this or the other way , you made your mobile number associated with your profile.
Yes ,privacy can be set up so that only you or your friends can  access your contact details. This is all about within Facebook.
 

However, say you want to find out someone's mobile number with whose Facebook profile is associated with. Then , no worry here's the way ,as Indian security researcher Suriya Prakash discovered recently. This could be boon in some way for telemarketers, hackers or spammers. Or you can used it in your own benefited way.

*Prakash found  that this was true for the desktop version of Facebook, but not the mobile one.

Here is how you do .

1. Log into Facebook on a desktop browser.

2. copy this URL and paste it into the address bar:

http://m.facebook.com/search/?query=1234567890

3. Then substitute the number string 1234567890 with the desired mobile number and hit "Enter."

(Be sure to include the country code prefix — "1" for the U.S. and Canada, "91" for India, "44" for Britain, "33" France and so on..)

If your Facebook friend's number or a particular mobile number  has listed on their Facebook profile,
or if he's got a Facebook app on his smartphone, it'll show right up.  In many cases, it works for "friends of friends" and for total strangers. See the below snap

Why? As Prakash found, the default Facebook privacy setting for "Who can look you up using the email address or phone number you provided?" is "Everyone."

(To see it yourself, click on the downward facing arrow next to the "Home" button in the upper-right corner of your Facebook page, then click "Edit Settings" next to "How You Connect.")

As contacted by TechNewsDaily, a Facebook representative said this was a feature, not a flaw.

"The ability to search for a person by phone number is intentional behavior and not a bug in Facebook," the representative wrote in an email.