Add on the map any service you want to get and wait for the people around to contact you. From there you decide how to carry it out to the end and you can score both to gain credibility with the rest of users.
It is open to all the possibilities of services you can think of: find someone to teach you how to play the guitar, learn a language, someone to lend you a book ... or even daily necessities such as walking your dog or go do your shopping for you. .. for sure that someone is willing to do them in exchange for something you can offer.
Quite simple and free!