From step 2 to step 6 we can grow steadily, but after a certain threshold our growth tax is going to quickly decrease due to the lack of new potential followers. We are going to exhaust this community: all users interested in our museum will follow us as after a while we will have reached all users in the community several times; and those not interested –the blue dots in the last step- will not follow us. But we need to get new followers out of this community to ensure mid-term growth.