I was on chat in stackoverflow and noticed that some of the message had grey stars with a black border and others were just black stars? What is the difference between the 2?
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The filled in stars are regular chat stars. The unfilled stars are pinned chats. Stars hang out for a while and decay, the pins will hang out at the top of the stars list, but will also decay after a while.
Only room owners and chat moderators can pin things.
(quote from comments)
The hollow stars are for messages pinned by moderators and room owners. They stick to the top of the side bar so everyone can see them.
The solid stars are for messages starred in the regular manner. These gradually sink as other messages are starred.
If the star is yellow - you starred it.