Follow along with the video below to see how to install our site as a web app on your home screen.
Note: this_feature_currently_requires_accessing_site_using_safari
It's seem to a bit costly. Rather then you can use Phpsfp script.You can use Facebook sharer pro. As far I know this is good software for auto posting in different groups.
Facebook Sharer PRO Demo
Please share the link if you really want to help.You may use "Facebook Auto Poster" for your automatic group posting. It's totally free.