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?
Update:
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'.