It does not matter where the complaint originated from as long as the complaint against BFL has legal merit. The matter would be dealt with in jurisdiction of Johnson County or at the state level depending on which office moved against the company as BFL has a physical presence here. If they do not have a registered agent handling their legal matters, then BFL would be served at their physical location.
Place incorporated does not protect the company from legal matters filed against their physical location. If their registered agent (often a lawyer) is located in a different state than the physical location then the company will have to find legal council in the jurisdiction of the physical location where the legal action was brought forth.
It seem you have a better understand of these procedures. What would happen if multiple unknown individuals served BFL from all over the globe? Would they combine them all in one suit?
No, it does not work that way.
This is correct. Even if you and a friend that lives with you filed separate lawsuits, you would each have separate hearings.
You are able to do a group lawsuit (essentially what you do is have everyone's name as different plaintiffs) but I have no idea how that would work when dealing with people in other countries.
A group lawsuit is called "Class Action" and it is best done through consumer organizations that bring claims on behalf of large groups of consumers. If the number of consumers run into thousands then yes a "Class Action Suit" may apply.
I was speaking (based on what the original poster was asking) on behalf of smaller groups. Ex. you get 5 people together to file.
Getting large numbers of people is very difficult. Not to mention, in many cases the company being sued won't have the funds to pay off many people, so smaller groups can be quite advantageous. It's really a gamble all on its own.