I'm still thinking about how to deal with reproduction- I have the option of constant egg production with the flip of a switch, but it might be an unpleasant mess if it means hitting max 'friends' every time. I'm just erring on the side of fewer 'friends' for now, to keep cleanup easy, and avoid chasing down individual 'friends'.
I've thought of adding in a meter, too, but it'd probably come with some sort of 'limit'- it might work well with the next content update.