There's no I in Steamocil, at least not where you'd think
Steamocil is a web site that allows you and our friends to find which games you have in common. Log-in through Steam, or put in your steam id number, and it will load up all your games and a list of your friends. Click on a friend and then it will show you which games you have in common.
Head over to steamocil.ggovan.uk to give it a whirl, but be patient as it may take a minute for an instance to spin up. Or you could check the source out on Bitbucket.
You'll never play alone. Remember, there's no I in Steamocil, at least not where you'd think.