Forum based is reality. It's "somewhat" slagged behind progression of data capturing.
In the capture of data one offered up. Intensional, or not. Modern social media outside of old school forums, seems to capture too much information for the purpose of advertising.
The algorithm used on Facebook surely drives content and advertising. It gets that I served in the Marine Corps. It seems to get that I was stationed at Camp Lejeune. So I get a daily barrage of ads from attorneys looking to represent people that were exposed to the contaminated water on LeJeune (even though I wasn't stationed there during the window the water was contaminated). One morning just having coffee, I ended up with 7 ads by different law firms looking for clients on the Lejeune water on my FB feed. I get daily ads from attorneys looking for veterans to represent over faulty ear plugs, fire fighting foam, asbestos exposure, etc.