Yes I'm happy you have noticed! :)
Well it does look like you have supported a fair few of the accounts that joined around the same time as you, and this fits with fullcoverbetting's theory. The first 3/4 months you seemed to collect many of your virtual circle, does that agree with what you expected?
It is what I would have expected. I really didn't have a clue what I should have been doing here during most of that time!