Actually, I like the occasional silences: it speaks to the rhythm of the seasons. Members are preparing for winter, in many locales. Houses and cars need preventative maintenance . Those who hunt are off in the woods; those who keep wood stoves are busy splitting and stacking; those who grow food are harvesting and storing. In short, people are out of doors while conditions permit, doing necessary and useful things, and the changing quality of the light compels them forward.
Unlike a Twitter account, there is no need to fill in the silences with idle chatter. Thought if it's too quiet for some, why, the solution is to post interesting stories and experiences.