I found a cat/kitten. It wore a collar and was very freindly, so I was sure it had just been accidentally lost. I posted a found ad at our local convenience store and on kijiji. The owner posted on our local facebook pet lost and found.
One of her facebook friends saw my notice at the convenience store, and let her know and she called me. Kitty went home.
Good result. The kitten had travelled more than two miles, so my next step of knocking on doors would not have worked. Sometimes I like the internet.