Default Sharing Dialog

As an alternative, you can show a standard ios sharing dialogue box and let a user decide where to post by his own. The sharing dialogue will look similar to the one on a screenshot below:

The implementation approach is similar.

Sharing a text message

using SA.IOSNative.Social;
...
ISN_Media.Share("share text");

Or text message with an image

using SA.IOSNative.Social;
...
ISN_Media.Share("share text", screenshot);