Congrats on the success of that.
Great piece of advice, too.
There's actually a book out that is a good read on the topic called The Little Black Book of Connections by Jeffrey Gitomer.
It's a big eye-opener realizing how many connections you COULD have had but lost that could've been a major asset.
The book is awesome.
Buy Gitomer: Jeffrey Gitomer's Little Black Book of Connections: 6.5 Assets For Networking Your Way to RICH Relationships