Bars, Clubs and Nightlife Forum

To simplify the process, start at places you like to hang out. This way, it'd be safe to assume you already have at least one thing in common...
Take a look around and start socialising, you'll find lots of new friends that you won't be sleeping with this way too.
However if you're an introvert looking for another introvert, chances are your best bet will be the depths of the internet dating scene.
Not everyone is a creepy fattie; I met my similarly 'ordinary' long-term boyfriend like this.

There's a reason it's called a family tree. Branch out.