For example, at the beginning of the pandemic, a famous biology professor was posting valuable information on his Facebook account. Reading the older posts and/

For example, at the beginning of the pandemic, a famous biology professor was posting valuable information on his Facebook account. Reading the older posts and/or comments requires logging in. Another example, a local hiking club is cooperating planned trips via Facebook. If anyone wants to join, they have no other option (maybe they can persuade someone already joined to forward the information to them via other means).