Two professional groups I am part of on Facebook are:

Entrepreneurs, Startup & Business Association of New York: https://www.facebook.com/groups/NYCESN/?notif_id=1589782338371301&notif_t=group_r2j_approved&ref=notif

Women Helping Women Entrepreneurs: https://www.facebook.com/groups/womenbizowners/?multi_permalinks=3315069328718484&notif_id=1589775298026040&notif_t=group_highlights&ref=notif