Startup Idea : Group Me - For Group Discussions

Basically in social sites or apps we have concentration in our related business.we ever need to explore more ideas for our business.It means we need sources for related knowledge.So I have an idea why can't we make GROUP ME app. in that we can share what's app groups by category wise & country wise (Ex.fun,HR,Marketing,Import & Export,Technical Ideas,etc.). group admin can add his group to application. the user who want to join the group can comment his no below the selected group and the admin of the group can add him/his into group for discussions. Later can add do it for Facebook Groups & Linked In groups.