Thats why Gang News is for. A lot of gang leaders misuse it to show rank openings and stuff like that.
If you have any questions or concerns towards era, be sure to send me a message.Spoiler
I clearly said its for a private use. And they're not misusing it - how's that misusing it? And using it to post 'Rank Openings' is public use, people make kik groups to discuss upon things, using the blackboard would eliminate that, creating a more frequent feature in the gang system.