Which online activity is least likely to have revealed Billy's location to a stranger?

Reading news sites in a browser is least likely to reveal Billy's location to a stranger because this activity typically does not involve sharing any personal information or location data. When browsing news sites, there is generally no metadata or explicit location information being transmitted to the site beyond the user's IP address. While the IP address itself can sometimes provide a rough estimate of geographical location, it is much less precise and does not give away specific details compared to the other options listed.

In contrast, sharing location on social media directly indicates to others where Billy is located, while using location-based services often requires the user to actively share their location for the service to function. Additionally, posting pictures tagged with geolocation embeds precise location data in the media, making it easily accessible to anyone who views the image. Collectively, these activities highlight how various online actions can expose an individual's location, with reading news sites being the most discreet in terms of geographical disclosure.