Startup Idea : App for share car ride with social ranking

Let's say that u go to work by car alone through the same rout every day and u would like to give rides to share gas expenses or even have a little bit of profit. Two question comes in mind: how can people find out that u giving rides, in a reliable way? And how u trust those ppl? Security in this situation is a big part, something that is not an issue for apps like Lyft and Uber. The answer is a share ride app with social ranking. Before even you give/receive your 1o ride, a person will be able to vote another person as reliable if he knows him from real life. Also, you will be able to see if the person is your friend or friend of a friend (Facebook account link). And, of course, when u give/receive a ride u will be able to rank and comment about your exp. For a ride giver, it will have an option to say what path, when (or which days for a routine rout like going to work), and how much. He will be able to set a lower price for more than one person in the car. For a receiver, he will be able to point on a map where he wants to be picked up, so he can find rides that pass nearby that point. Also, he will be able to set a time that he wants to be pckd up. Payment will be like Uber.