I have written about the problem of photo metadata being leaked by blogging platformsMost shamefully this one before I fixed that problem for good. before. See Parsing XML EXIF from .avif files (plus a rant) and You Should Be Stripping EXIF Data out of Your Image Files Before Posting for the details but for the TL/DR:
Cameras helpfully put a lot of metadata in your photos. Most of this is innocuous technical data, like the color space and the camera orientation. But the exact GPS coordinates that the picture was taken are also included. This can be very useful for you but if you take some pictures around your house then anyone who as access to the unmodified files knows exactly where you live.
The operative word in the preceding paragraph is unmodified - most social media sites strip out the location data before displaying your photos to other peopleOf course, they still get your location data, which is useful for selling you advertising.
The operative word is the preceding paragraph is most. Someone named Usama Ejaz just emailed me with the results of some tests they ran on various platforms in their post Photo Location Data on a Blog: Which Platforms Strip GPS on Upload, and Where the Original Still Has It.
Long story short, even popular blogging platforms such as Ghost and WordPress (sometimes) keep unmodified copies of uploaded photos available for download. This is a surprising result to me and all the more reason to strip out location data before uploading. iOS has a useful option in the photo sharing panel that does exactly that, although it is not on by default.