Today, startup Plerts is unveiling a service that combines accessibility, geographic location, and privacy for medical and personal safety. It’s like Foursquare meets safety alerting system Life360. Plerts allows users to privately tap into their social graph when they need extra peace of mind. You select those individuals beforehand, and they agree to be part of your alerting system. If you are in danger or miss a checkin that you set, those individuals are alerted via multiple modes (email, SMS). Plerts is launching simultaneously as a free iPhone app, a Facebook app, and as a traditional web app. For example, if you decide to buy something on CraigsList and visit a seller’s home that is unknown to you, you could enable a Plerts alert. If you don’t check-in after the visit, Plerts will alert the member of your social graph with an alert that you are rogue. Another example is to Read More