Can't Catch 22

For some time now I have had 21 followers to this blog: a number which has remained resolutely unchanged. Except that on a two occasions recently I have noticed a 22nd follower.  On each occasion I have returned to the list of followers after completing the task in hand to see who this new member is and on both occasions follower number 22 has disappeared. There are no perks to being a follower; no special services or privileges so perhaps that accounts for the very exclusive nature of this little club.