How to view the existing comments posted by user in map

I am creating a map applic开发者_StackOverflowation which is actually like a travelling guide that allows the users to get the directions, and the current location and the user can post a comment at a particular location and take or upload a picture at a particular location and save it to the map.

And it has feature that the user can review the comments posted by other user nearby to his current location. How can I do that?

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I think you need a backend server, and implement your own web service or rest api for store location, picture, and review. You can choose GAE, EC2, etc.

Or, a more convenient choice, backend service for app. Like Parse, Kinvey, Cocoafish. Take a look at this link: Cocoafish's Create Review Api Document

You can call this api, let user post comment at particular photo or place.Then call their photo or place api to show what user want.