Yesterday I receive an email that was a blow to my ego. It seems that once a year, the Cluster Map fairy comes along and sweeps up all the dots on your Cluster Map and takes them to Cluster Map heaven.
But they are not gone forever. I can visit them through the statistics on my account page and they won't leave me with a barren landscape, because my current map will stay as it is until the next time it updates. It updates when the number of hits since the last update reaches 10% of the numbers currently on the map.
So my ego is intact for a while, and I'll say, "Hi and bye." to my clusters before they slip off on their journey with the Cluster Map fairy. RIP little Cluster buddies...