 has, without warning, sent me 16 mana seemingly as a response to 

I can't just not follow up on that. I can't leave that on my conscience. That would be shameful of me. 

 is the 0th Manifolder in this chain. I am the 1st. The same Manifolder cannot be in the chain more than once. 

A new Manifolder is added to the chain when they managram another user with a memo that contains and starts with the phrase "double it and pass it on" (non-case sensitive). I may make good faith exceptions to this memo rule at my descretion. 

Additionally, their managram needs to be made within 48 hours of them receiving their initiating managram to count. 

Only the 1st valid managram sent by a user counts. Sending multiple to the same or different users will not count the 2nd attempt and beyond. 

Market resolves to how many Manifolders successfully "doubled it and passed it on".

Shame upon the Manifolder who breaks the chain. That, or shame may be also be brought upon the Manifolder who sends their managram payload to an inactive or distrustful user.