From Seth Godin:
Here, it's simple:
You can contact just about anyone you want. The only rule is you need to contact them personally, with respect, and do it months before you need their help! Contact them about them, not about you. Engage. Contribute. Question. Pay attention. Read. Interact.
Then, when you've earned the right to attention and respect, months and months later, sure, ask. It takes a lot of time and effort, which is why volume isn't the answer for you, quality is.
That's a great way to get a job, promote a site, make a friend, spread the word or just be a human.
Yes; you can canvass, you can cold call, you can spam, you can 'play the numbers game' and you can sell. But there is a better way; it requires patience, thought, delivery, and service -- it focuses on the quality of your product/service and the quality of your relationships. Both forms of selling/marketing have their place in the continuum, but I will always advocate the giving/respectful approach is much better than the intruding, irritating and obnoxious "cold calling" model.