Trackzio is a great combination of Location based services and geo fencing. It is relatively a new social media platform that allows people to engage with each other. It gives the real-time location of friends/team/family members who decide to share their location with others.

Geo fencing is like creating a virtual perimeter within the specified range of a particular location, sowhenever a person enters the digital boundary, his/her follower receives a mobile alert. Mobile alerts are triggered only when the person who is being followed arrives within the specified range of a particular location.