Relatively important for linking in social media:
- home
- about
- donations
Less important:
- imprint
- blog index pages
The logic can be to fall back on a standard banner if nothing better is defined. In which case a pretty convincing standard banner would be useful.
According to https://developer.twitter.com/en/docs/twitter-for-websites/cards/overview/summary-card-with-large-image it should be in 2:1 format and have a minimum dimension of 300x157.
Related, I'd like a card template for blog posts that announce conference/presentation dates for people to join. I've used something a little shoddy in the past.
Assigning this to @analuisa, but let's discuss first.