When a mobile device adds a location to posts on social media platforms, this is called __ a. a blog b. geocaching c. sociability d. geo-tagging

## Step 1<br />The question is asking for the term that describes the action of adding a location to posts on social media platforms. This is a feature that allows users to tag their posts with a specific location.<br /><br />## Step 2<br />Let's analyze each option:<br />- A blog is a regularly updated website or webpage, which doesn't necessarily involve adding a location to posts.<br />- Geocaching is a recreational activity where participants use a GPS receiver or mobile device to hide and seek containers, called "geocaches" or "caches". This doesn't involve adding a location to posts on social media platforms.<br />- Sociability refers to the tendency to associate with others, which is not related to adding a location to posts.<br />- Geo-tagging is the process of attaching geographical identification metadata to a photograph, usually a digital image or a physical photograph, which allows the image to be associated with a specific location.<br /><br />## Step 3<br />Based on the above analysis, the correct answer is 'geo-tagging'.