public function createCheckin($user, $place, $coordinates, $tags = null, $message = null, $link = null, $picture = null)
	{
		// Set POST request parameters.
		$data = array();
		$data['place'] = $place;
		$data['coordinates'] = $coordinates;
		$data['tags'] = $tags;
		$data['message'] = $message;
		$data['link'] = $link;
		$data['picture'] = $picture;

		return $this->createConnection($user, 'checkins', $data);
	}