Default Sharing Dialog

As an alternative, you can show standard sharing dialogue box, and let the user decide where to post by his own. The sharing dialogue will look similar to the screenshotы bellow:

skitch.pngskitch.png

API calls example are posted bellow:

UM_ShareUtility.ShareMedia("This is my text to share");
UM_ShareUtility.ShareMedia("This is my text to share", ImageToShare);