Unique ways a VC can source potential startups to invest in?

What are some lesser known ways a VC can find potential startups that would be good candidates to fund? Apart from referrals and AngelList.

The venture capital landscape is crazy right now. The power definitely resides with the startups. There is more money than good ideas to invest in.

Here is what some VCs do to stand out and attract the great startups to them:

1. They put out great content

First Round Capital is the winner here. They offer the startup community so many thoughtful pieces that provide insight and ideas for strategy.

2. Create a product that startups are glued to

Hacker News played a critical role in YCombinator's success.