"Never use the same login for 2 websites"
I call BS to that. Fair enough for websites that use your banking or credit card information, but for the rest? I don't think so.
For irrelevant sites such as Hacker News, Reddit, whatever other minor web 2 site you can think of, you should ALWAYS use the same password. Why fart around with a ridiculous number of passwords for websites that are nothing more than minor daily distractions?