I use the Create and Save Place API to allow people to have private servers that save their work in a building game. About 2,000 places have been created from this, and every single one of them shows up on the feeds of people with me listed as their best friend.
As Universes and Creating Places become more popular, more and more feeds will be filled with these places and it will create unnecessary spam.
Additionally, I use userId in the place title’s to identify the owner. However, when a Guest (previously, I removed their ability to create private servers) created one the id (a really large negative number) would somehow be parsed as an offsite link (an IP, I presume) and the place title would be deleted. I received a moderation notice from this as well.