Could this be the end of password re-use?

It’s password security’s Achilles heel: too many people make life easy for cybercriminals by re-using the same ones over and over. But what if there were a way for websites to compare notes on whether a password (or similar password) has been set by a user elsewhere?

Facebook prowls the internet looking for your password

Facebook explains that it’s keeping its eye out for credentials – email, password combinations – dropped on sites after data breaches, running them against its own users’ credentials to see if password reuse is going to land its users in trouble.

Dropbox passwords leaked, third-party services blamed

Hundreds of Dropbox logins were posted on Pastebin and Reddit, but it turns out they were stolen from a third-party service months ago, Dropbox says. So why did some of those passwords work, as Reddit users claimed? Think password reuse.