Wow! one more interesting ,useful feature on Facebook. Now you can see How many of your Group Member's saw your post.How many get them.Facebook will add a new feature called Who saw Your Posts soon. According to Facebook news room they said that "Starting today when you visit a group, you can view who’s seen each post. This way you can stay updated on the group’s activity.".Check your Group today then you will get what we have said.
Image shown below will help you to understand more.
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