Yes, pranking is allowed (for now, if people abuse it then it will be made illegal)
Pranking does not mean griefing. Griefing is stealing, breaking their base, destroying their stuff, flooding it, killing them (unnecessarily/when they say not to), any of that sort.
Pranking is light-hearted, friendly, type messing around. The general rule is ensure that the person is alright with pranking before doing it - either by asking or some other means. Usually it’s best to prank friends, only, not strangers. The premise is that you prank someone, say like, block out all the light in their base with dirt, and then leave a sign saying it was you. This then gives them the right to prank you back.
Ex of pranks: blocking out the lights of a base, spam signs, etc.
*If you are ever unsure about if it is okay to prank a certain someone then do not do it. Also ask me or another admin if you are not sure on a prank idea you have
Examples of what not to do in a prank: Place lava/tnt/blocks that can grief/kill the player without them getting their stuff back. Destroy any redstone. Rob/steal from them. Destroy any of the blocks in their base, kill any animals, mobs, burn any blocks, etc.
Again, if you are unsure about any of them please ask an admin or myself.
Another point to make is you should not gang up on people. If someone had been pranked recently (within the month) then do not prank them on top of the other prank. Also do not prank someone twice in a row unless they retaliate. It is about being considerate of their game play.
Another mentions is PUBLIC/COMMUNITY areas are off-limits to pranking.
List of people on DO-NOT prank list:
*if you are on this list you cannot prank others.