Thank you! I started it 2 years ago and have written many articles about it under Hive account@magicmonk.
I wrote this article just before the SteemSQL subscription ran out, so steemfriends will not work right now because it does not have an active SteemSQL subscription.
HF21 did not destroy it - it's just that the date that it started coincided with the date that SteemSQL subscription ended.