Riding With Friends
Who you rode with is an important part of your day, and with Slopes you can capture that in-app. To start, make sure you've added the person you would like to tag in your day as a friend in Slopes.
Once you've done that, when you're editing an activity, you'll see the ability to add them to your day as someone you rode with. But in most cases, you won't have to do this! Once both of you hop online and your recordings can upload to the Slopes servers, they'll notice if it looks like you rode together (by looking for lifts that you shared, +/- a few chairs), and automatically tag for you!