Multiple tag facebook photo with Graph API in iphone sdk
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I want to tag multiple users at once to Facebook photo with graph api. But when i am going to tag, it is giving me error. My graph API full path is below:

https://graph.facebook.com/434258356608193/tags?tags=[ { "id": "100001040836918","x":0,"y":0 },{ "id": "100003494241669","x":10,"y":10 } ]&access_token=BAABpVhZBeHdIBAKSOAaqlX2jZAZCOZBSalymXxzvOsZAxszeGOsR7KEEVWHsZCzvAugMZA4SdNDU0q3HfTRG8PA7y7w7Qhe7TCEFBMrN7RZCewlMZB3uKU6D2fiitdTZBG1zfu43a10qOz1B4gY04AfXeZC

when i am trying this url in browser, it is giving me below error:

{
   "error": {
      "message": "(#100) Param tags must be a a string",
      "type": "OAuthException",
      "code": 100
   }
}

Please help me how i can tag multiple users at once with graph API.

Thanks in advance.
