Final answer:
The Topix forums for Quanah, Texas didn't move to another city but transitioned to different online platforms after Topix shut down in 2018.
Step-by-step explanation:
The forums previously hosted on Topix for Quanah, Texas, did not move to a physical location such as Dallas or Austin. Instead, Topix ceased operations in 2018, and many of the local forums, including those for Quanah, transitioned to new or existing online platforms. These platforms continue the community discussions that were once part of Topix. Since Topix was an online community, it would be more accurate to say that its users migrated to different websites rather than moving to a different city.