Activity “Linking”
“Linking” occurs when a user indicates that other RP users participated with them in an activity. Such linked individuals are “RunPartners” for that activity.
Adding a “Link”
The “Link w/” box in the Add Activity page allows entry of the people you participated with. ONLY people who are your currently friends with (see Privacy Settings) can be added to an activity. Teams can also be Linked to this way.
The power of Linking activities is that your friends can now prefill their activity. There is no need to call someone and ask how long a run was or go find their log entry. We’ll do it automatically.
When you Add Activity for a day on which someone Linked you, you will get a popup offering to fill in the form with their information. Before filling it in you can Preview the information that will be filled in. You can also Ignore it and it will be hidden or you can Remove it.
Clicking Prefill will update all applicable fields in the activity form and hide the Link popup. Note that a small excerpt of the comment rather than the entire comment is shown, so that you can jog your memory of the activity.
Removing a “Link”
If a Link was made in error, or if you did not want to be Linked to, you may easily remove the Link. Simply visit the calendar page with the Linked activity, hover over your name and click the 
button. Links can be remove by both the people that made them and the person that was linked. Linked Teams can be removed by the team officers.
Links can also be removed through the popup in the Add Activity pane (see above).
“Linking“ Notifications
By default users will not be notified when someone Links them to an activity. By enabling Linking notifications in the Settings>Notifications menu you can receive an email every time a user with the activity a user Linked you to.