The most crucial part of a deal is closing it. When it comes to negotiating, you better make it quick, otherwise it will turn into an undesirable, and never-ending torture.
This is all part of an effort from Facebook to make the groups more transparent and give a chance to group admins to see how many unwilling members their group(s) have.
Facebook has become the most popular social networking site, so it offers numerous advantages if you decide to use it. You can easily reach your target audience with some invested energy, time, and attention.