Great infographic and important to only use the posting key most of the time. Active for wallet/voting related stuff.
The memo key is less talked about but kinda cool.
You could probably add on the info graphic on how to send an encrypted memo (although it doesn't hide the amount or the account you send to, just the actual memo itself).
For anyone who wants to know, in the memo box, put the # symbol at the beginning, followed by a space, then your message, and it will (hopefully) work:
The recipient will then be able to read the memo by clicking the padlock button and using their memo key:
