def user_parse(data):
        """Parse information from provider."""
        resp = data.get('response', [{}])[0]
        yield 'id', resp.get('uid')
        yield 'first_name', resp.get('first_name')
        yield 'last_name', resp.get('last_name')
        yield 'username', resp.get('nickname')
        yield 'city', resp.get('city')
        yield 'country', resp.get('country')
        yield 'picture', resp.get('photo_big')
Parse information from provider.