is the a limit to the number of people to add to facebook group
There are groups out there with tens of thousands of members. Groups of the old format that are that large are up for archiving, which will make them inactive (but the content will still be readable.) Groups are intended (according to FB FAQ) to help you share with the small groups of people in your life.. Causes, event or business promotion and corporations/organizations are expected to use Facebook Pages instead of Groups. Shared interests for topics (like Cooking or Photography) now have community pages.