1. SQL Involvement
Databases that uses your SQL ( Structured Query Language ) rely basically on the large number of queries that are used to locate and retrieve data from your database.
Hackers can send this request to your networked system and can destroy or change your database internal code and hence can get the critical information about your system . Offcourse this protection is not in users hand , using a good software techniques & well-designed software avoids the problem by weeding out any queries that don't meet strict standards.
2. Session Hijack
If you work in your office or university for a long time , like you are working on your laptop since morning and its afternoon , using a shared wireless network then you are not only the person logged onto google plus , facebook aor any other social networking website , you may also logged onto your PayPal account or eBay account , Mozilla Firefox uses add-on namedas Filesheep that can view other user's broweser's activity on the same network .While the illicit observers can't get a glimpse of secured pages, many sites secure only their login pages; once you're logged in, your presence is maintained purely through cookies, packets of data that your browser stores to keep track of your browsing needs. But Firesheep lets its users copy your cookies.
3.FaceBook Social Website is Everywhere
It is not possible that anyone of us is not having his/her account on facebook , It can happen but rare.
The social networking site has become an ever-present hub for everything online. For some less savvy users, Facebook only is called as Internet :D
might not have noticed is that other sites have started targeting your Facebook demographics as well. Any time you browse the Web without first logging out of Facebook, other sites can get access to any profile information you've marked as fit for public.
"Log Out Your Facebook Account Everytime You Are Away or not using it" :)
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