Aside from anything else, really? Your app allows a user to send regular, scheduled text messages to friends saying "Where are you?" so that you get the benefit of knowing where they are? That sounds horrible for the recipients of these messages that I effectively have no way to opt out of, without telling my friend to knock it off. I could choose to ignore the request, sure, with the potential for passive-aggressive drama to follow.

What are the use cases for this app that "Hey, where are you?" won't suffice for? "Here, click on this link and I'll see, on a map, verified by your phone - and this website will also get to know."