CoalaWeb Social Links up until a few versions ago used what was knows as sharer.php to share with Facebook and it gave you the option to choose where to share to for example a page or a group(like your image). I was having some issues with it and after contacting Facebook they told it had been depreciated and replaced by the Sharer Dialog system which only offers the option to share to a personal time line.
So based on their advice I moved CoalaWeb Social Links over to the new Sharer Dialog (which also needs a Facebook ID which the old system didn't). But I have since seen that although they have removed all the documentation for the old version it continues to work which I think is because so many people are still using it Facebook is reluctant to remove it.
In response to this I will be including an option in the next release where you can choose which one you want to use. I would recommend setting up the new Share dialog but use the older system with more features then if they ever decided to fully stop the old system you can easily switch over to the new one.
Hi! I'm Steve the founder and head developer of CoalaWeb design studios. I'm an avid supporter of open source projects and the GPL license.