I notice that if I mention more than 3 people in a post, itll only actually recognize 3. So only those 3 will see their mentions in their newsfeed.

Is it possible to change this feature that more than 3 people can be mentioned in the same

I believe this is a limitation of SharePoint 2013 social features that you cannot mention more than 3 people.

http://www.jeremythake.com/2013/01/the-current-state-of-sharepoint-2013-social-collaboratio