I came across this Intel How Strong is Your Password? page which estimates how strong your password is.
It has some advice on choosing better passwords including that you should use multiple passwords.
But then after it says this:
Step 3: Diversify your social passwords for added security
"My 1st Password!: Twitr" "My 1st Password!: Fb" "My 1st Password!: Redd"
Does this increase security over just using "My 1st Password!"?
I thought the reason not to use the same password more than once is so that if a site compromised, your passwords for other sites are still safe.
But if your password here was "UltraSecurePassword: StackExchange" wouldn't it be easy to guess your Facebook password would be "UltraSecurePassword: FB"?