I have done everything that I can think of to prevent companies like Facebook from knowing my actual location, yet recently I've started noticing extremely specific ads from them.
For example, I went bowling for the first time in years, and hours later started seeing bowling advertisements on Facebook. I believe they only knew this due to my phone being physically present in a bowling alley for an hour.
I initially assumed it was just paranoia on my part, but it has happened several more times with stores that I have visited.
Things I have done
- Uninstall Facebook app
- Disable location services in iOS
- Being very cautious of what I type into search engines
- Avoiding entering store locations into google/apple maps
- Avoid joining public wifi
I've checked with my cell phone carrier, and they 'promise', that they aren't selling my location.
What other mechanisms could be leaking my location?
Going into iPhone location services, I discovered that I do still have the 'Facebook Messenger' app installed, and it is by default configured to share my location 'Always'.