Meetyou.me has an interesting feature where friends can send secret message to each other.
1- To send the secret message you must be friends with the user to whom you want to send the message.
2- Type ( /msg ) and the exact username of your friend you want to send the text.

3- Remember you both need to be actively chatting in the group to avoid any resistance in sending the secret messages.
4- If the secret message didn’t go at first don’t worry you’ll get an option to resend it.
Blog by user – Y*****7.-