If you use Facebook very often and you have been on Facebook for years, you have surely faced the error “This content…
The How-to is step by step advices to help users to accomplish a specific task.
To turn off the comments for public posts: Setting & privacy>Setting> public posts> “who can comment…”> Edit
To wave on Facebook, the feature should be on top of the conversation, when you open a new thread on Facebook Messenger. if you don’t see the option, it might be removed by Facebook itself, and you cannot take it back. instead, you can use wave sticker available on Facebook Messenger.