This link is not an activity module or even a block that can be integrated into moodle in any ways. It's an independent plugin for 'Skype' with nothing to do at all with moodle. I wasted several hours trying to figure out how to integrate in into moodle, expecting that it should work since it was in the moodle database of modules.
I strongly suggest it should be removed from there.
Also, users posting such advertisments into moodle should be strictly warned and then banned. Look at this users contribution to moodle here, its just been advertising his own products.
We probably need a 'Complaints' forum now, and also some moderation !