I was looking for a hard to find an electronic part (data bus transformers) a couple of days ago and checked out the website for a company that manufacturers them.
While I was on the website my work phone rings and when I answered it, a salesperson for the company wanted to know if I was finding what I am looking for?
After freaking out a bit trying to figure out how they knew who I am, I told them no I didn't find it yet... but this is what I am looking for. They helped me find the correct web page, and sent me a price quote for the parts.
This happened because I had visited their website about two years ago and signed up for an account to view certain data on their website. I guess it ended up being a good thing in this case.