The Blizzard executive also sent out a tweet indicating the removal prior to Blizzard support lying to the player base as to why it was removed. The Blizzard executive indicated it was because of a player named Infinilock (A Multiboxer of warlocks). The day after the tweet and after the patch with /follow removed was when Blizzard was forced to come up with a different reason for the removal to protect the Blizzard executive.
Here is the tweet:
https://twitter.com/holinka/status/309326759252336641