This is common knowledge; you should use a combination of alphabets, numerical digits, and special characters (!, @) to create strong passwords. Yet, the most commonly used password on the Internet is 123456 followed by 12345 – see full list.
The following visualization courtesy CXO categorizes some of the popular passwords based on their strength – it might appear a little funny but lot of people are actually using such simple, easy-to-guess passwords for their online accounts.
via How Strong is your Password? Check your Password Strength Online.
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