The hacking of user credentials has been recently faced by some of the major IT companies like LinkedIn and Microsoft India. You, as a service user, have no control on them, but another stand is yours. That's choosing a strong and a less common password, difficult to guess. This will protect your account from random login attempt by some bad guys. It may be one of your friend trying a combination he saw you typing somewhere.
I am not talking here about how you can have a strong password, and do's and don't for that. But populating a list of some common, or rather say a worst list of passwords most of the users have. These are easy to remember, and also easy to guess.
Top 25 Password String
This list is compiled by Mark Burnett, an IT security consultant. He exposed some more interesting facts about his research. As he observed, the top 10K passwords are used by 98.8% of all users. See the frequency graph.
Top 25 PIN
These 4-digit PINs are used in ATM, digital security locks and other handheld devices. Setting an easy code for them minimises the number of trials for a thief.
If your favorite security code is there in the 'famous' list, consider changing it ASAP.