Ask HN: How did you find your first 100 users in a B2C environment

If you have founded a startup, how did you find your first 100 users? Especially for a B2C startup.

Here is what we have tried - Friends and family (obviously) - Sending personal emails to people that might be potential users - Creating content for organic search traffic - Posting screenshots of our product on Imgur

What other ideas can we try?