Ensure that method for showing Facebook profile photos works with Graph API v8.0

[ErikBoesen]

https://developers.facebook.com/blog/post/2020/08/04/Introducing-graph-v8-marketing-api-v8

The first point (for showing user pictures) may affect us: "A client or app token will now be required for querying user pictures through public_profile. Queries without a token will return a generic silhouette as the user picture."

This may not be breaking, but just check on it to make sure everything's fine.