There are several places on the web to get tandem related info and ask questions of other tandem enthusiasts. The three main places are below. You can search these forums to find answers to most anything you want to know, and if you can’t find the answer, ask the question!
Discussion
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BikeForums Tandem Forum
BikeForums.net hosts many discussion forums on all kinds of cycling related topics. The Tandem Forum has a lot of great info and tons of people reading it that can, and probably will, answer any questions you may have.
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Tandem@Hobbes
Tandem@Hobbes is the OG of web based tandem info. It has been around for almost as long as the web but has changed formats recently to be a Google Group. It's not a super active forum, but there are a lot of knowledgable people in the group.
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MTBR Tandem Forum
If you are looking for info related to tandem mountain biking, this is the place to go!
Following are all Facebook groups for tandem info. I am sure there are more, but here are a few: