This is a good concept by the maker but when I use this app then I think sarahah is not useful to me.
When I write a message to my friend then I found a secret of sarahah that their is no option to reply. So when I message some one then he/she not able to reply me.
1st sarahah hides sender ID and you don’t give any option to reply this bad for me as a receiver.
And as a sender it is bad because no one believes you when you claim that you are a sender of any message.
I think concept is good but it got waste because of no reply option and hidden Identity.