I started with Facebook as some of the Guzzi clubs were on Facebook rather than a dedicated site, like here. My conclusion, without wishing to dis Moto Guzzi fans, is that Facebook is weird, for weirdos. I keep getting emails where they suggest groups for me. What prompted this one, God only knows:
I've not used Whats app but it's free to use and i chat to my friends in Italy and Oz on it and you can do phone calls as well.
We have a family group on Whatsapp that is fine. As we are all spread around the country it is useful. No spam. Out of the group, I can communicate with my younger brother in Thailand. It's cool.