Obst said:
This topic isn't very clear to me. What looked like tag vandalism? What do you think has changed about the tag?
The truth tag used to be for images that showed things users could relate to. It was the Danbooru tag equivalent to the Pixiv あるある tag.
What I call tag vandalism is that I have been putting the truth tag on images like that intermittently over the last several years unaware that it was changed and for that I apologize for any inconvenience that may have caused.
The truth tag wiki was changed on 2013-02-06 by lady garegga to:
Images with a mission to deliver an educational or insightful message.
Use on Danbooru
Any image which carries such a message either in itself or an accompanying text commentary by the artist.
Only use this tag for images where the artist is communicating in honesty or frankness.