The term "user groups" has a technical meaning in the realm of affiliation, which isn't what you meant here, presumably. See m:Wikimedia User Groups.
Topic on Talk:Reading/Strategy/Kickoff
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You're right. I removed the term "user groups" and changed "segments" to "user segments".
I did that on the content page. I also realized I needed to do this on the "About this board" box as well, so did that too :)