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We figured, perhaps wrongly, that pinned topics were less about "this person created it" and "that person updated it" and more "this is valuable community knowledge, some part of it has been updated".
We also strike a balance between the yellow highlighting, and the space it takes. They get a highlight, but we reduce the space.
Those two things combined mean that yes, we communicate it's pinned (yellow highlighter), but no we aren't showing much info for it.
Pinned topics (current projects for example) that show up in Following don't show the user who created them or the last user to post (they are also now showing up shaded yellow)
In fact - they don't show this info in the forum view either (or Today)