I am getting the error message:
Insecure Login Blocked: You can’t get an access token or log in to this app from an insecure page. Try re-loading the page as https://
Command used in Rstudio:
appID <- "My app ID"
appSecret <- "My app secret"
fb_oauth <- fbOAuth(app_id=appID, app_secret=appSecret, extended_permissions = TRUE)