Twitter is my favoured platform, and that's where benches are posted first - usually about 21:00 UK time (BST or GMT) - https://twitter.com/cumbrae_benches
Cumbrae benches does have a Facebook page, and an Instagram presence, but these are a bit behind the Twitter posts - https://www.facebook.com/Cumbrae-Benches-104613451895368 and https://www.instagram.com/cumbrae_benches/