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Once in my previous job working in a tech startup.
As a small team we collected 1000 emails in 3 days from potential customers at a trade show. We did that by talking to them, sometimes individually, other times in groups.
The internet is a great way to reach true fans, but possibly the most powerful way to make a connection is to go direct.
In my case I flew half way around the world to attend a trade show, but there are other ways to go direct.