One of the ironies of the times we live in, forums are flagged by companies and Facebook is not. I suggest that the club communication plan focus on purpose.The forum is nice because it is great for storing information and searching is breeze.
For instance:
Forum - announcements, club member discussions and storing information
Facebook - outreach to non-club members, standard breed information and advice, non-technical discussions, announcements, real-time event updates
Instagram - outreach to non-club members, announcements, real-time event updates
MeWe - club member discussions, outreach to non-club members, announcements, real-time event updates
Twitter - announcements, real-time event updates