I have used busy since it was a being tested beta. I remember the very first day of encouraging user to use "busy" tag. People who is not aware that time is questioning me why I used #busy since my post is not ralated to busy.org topic. I also got some flag from those user's for spamming #busy. Perhaps now they have knowledge and I am sure they use #busy on there post. I keep monitoring there use of tag and just laugh at them. My adviced read often.