I like to check the password retrieval 
option of different sites and when i was checking out Gmail's option i 
found and interesting thing. Its not something ingenious or new thing 
but thought of sharing the observation with everybody so please forgive 
me if it seemed to you a time waste.
So first lets take a look at the Gmail's password retrieval option.
So
 when you click on the 'forgot password' option and provide the email 
id, in Gmail it gives you three password reseting options.  
- 
it sends the password reseting  link to your alternate email id, which you had provided  during the  account creation. 
- 
It sends a random password  reseting code to your mobile through sms which you have provided  during account creation. 
- 
It asks the security question  whose answer you have provided during the account creation    - 
(it asks the security question only if  the account has been not logged on for the last 24 hours.) 
now the first two 
option are of no help unless you have hacked the alternate email id or 
somehow you have in you possession the the users mobile. Mostly all 
major sites asks two security questions but Gmail asks only one (only if
 the account has not been logged into for the last 24 hours) now random 
questions are sometime hard to guess but here again Gmail makes the 
mistake, to see it we will have to go back in time when the account is 
actually being created. While creating a Gmail ID it asks you to choose a
 security question , it gives you the option to select a question from 
the default set of questions which Gmail provides for the users 
convenience or you can create your own question. But mostly the users 
selects one of the default question, (there can be many reasons for this
 foolishness, like impatience to start a account , laziness or the 
person may have not understood its importance. Now if we take a look at 
the default questions they are mostly odd and so mostly the person 
selects one of the following familiar default questions.
- 
What was your first  ever mobile number . 
- 
What was the name of  your first ever teacher. 
For the first 
question the person doesn't understand the importance of giving a unique
 answer which only he knows and he casually gives his current mobile 
number as the answer. (in india mostly all the young account user are 
using their first mobile number and they give it as answer).
Now
 this are very easy questions to guess and Facebook makes it more easier
 than you can imagine as mostly all Facebook users provide their current
 mobile in their personal information section.now all you have to do is 
answer the securtiy question and reset the account. once you reset the 
gmail account you can easily reset the Facebook account linked to it by 
using the Facebook's password retrieval option. But Facebook has one 
more line of defense when you reset the Facebook's password. When you 
log into it the first time it won't stop you but it will notice that the
 account has been logged in from the computer with a different IP 
address and when you try to log in the next time it will all ask you 
some easy confirmation questions to make sure you are the real account 
holder.
Now many of you 
would think that the probability of success of this method will be very 
low. So i conducted a small survey of my friend's Facebook accounts 
(with their prier permission) lets have a look at what i found out.
I selected 20 of my close friends who use their Gmail account to log in Facebook.  
14 of them had not logged into their Gmail account for the last 24 hrs.
5 of them had the security question about first mobile number and 2 had the question about first ever teacher.
3
 out of the 5 had given their current mobile no. as the answer which i 
easily got from their Facebook account information and  1 out of the 2 
with the question first ever teacher was my classmate and after  some 
tries i got the right answer.
So in under an hour i could have  reseted  4 out of the 20 Facebook account.
So by seeing the above result you can guess how careless sometimes the user is towards his online privacy.
( I wrote this post 
to make the readers aware of how even small carelessness can put their 
online security at risk. This should not be tried as the account 
password is reseted and the victim will soon find it out and i myself 
consider reseting others password the most sadistic online act. )