Multi-player account

If my roommate starts playing, will it flag as a multi account since we will be on the same location? I've been trying to get him to play because he likes simulation, strategy, and fighting games but I want to make sure it would not be flagged. I could make sure he doesn't start on FB where my main empire is.

The system can distinguish between 2 different players in the same location and 2 accounts run by 1 player.
Don't worry, and by all means, don't avoid playing on the same world together

I can confirm what jonni said. My old roommate and me used to run an empire each on the same world. We had our fair share of interactions, both friendly and not so friendly, and never had a problem.

Ok good to know.