[Sunlis]

I use so many different services/sites that having a different password for each one is unrealistic. Here's a small sample: Personal email, work email, version control at work, Github, bank, university systems, personal computer, work computer, Facebook, Hacker News, Reddit, Steam, Skype, ... I could go on. In order to keep track of all of these unique passwords, I would need some kind of protected database like 1Password [0] (which I do have), or a notebook with them all written down. At this point, however, cracking/guessing a single password or obtaining a physical notebook has given someone access to all of my accounts.

What I typically do is give "important" services unique, random passwords (bank, personal email, work email; things that can do damage), and use one of a set of passwords for everything else. If one password gets found, then maybe only my Reddit, Skype and a few forum accounts are compromised. This has the advantage that I use the unique password frequently enough to memorize them, and non-unique passwords are used in a few places which results in them also being used enough that they are memorized.

[0] https://agilebits.com/onepassword