AFAIR STS automatically strips all exif.
EIRN: The risk you run is that someone, likely authorities, tie your account and your pictures to a certain location or even to you as a person. So if you took a picture of a large plantation of questionable crop and it does contain EXIF (It doesnt on STS, just like STS doesnt have you guys IPs) then law enforcement could have a look at it. In the worst case: They have the exact location of your plantation and the serial number of the camera you used, if they find that camera in your home you look pretty guilty. But luckily there is no illict activity on STS, so this all is more a "general privacy" discussion.