I started a secondary account (f2p) right before they changed the mods to only being used on 6 star mechs and played it up to around 88k on the progress path and during that time I had gained 100 friends on that account. I hadn't logged into that account for about month until yesterday and 94 out of the 100 friends had stopped playing and 4 of the 6 left were only a few days away from not being active for a week. 94 and counting out of 100 stopped playing in a months time, I wonder why!