It is a nice idea, Steem Messenger would be the easiest way to communicate with other Steem users through the blockchain (on-chain) via transfers.

Some months ago @therealwolf created a steemit messenger app where you can communicate with others steemians, but why I don't like the the app is that each message sent will attract 0.001SBD/steem, the name of the so called app Is Steem Messenger(BETA).

I know an app also where you can earn for just commenting, posting, upvoting by using the app, this app is just like eSteem app, you can blog with it without using browsers, you will turn all the points you have accumulated to upvote, this function just added recently when they upgrade their app, the name of the app is Partiko, you would have seen many steemians using it because at the end of the post or comment, posted using partiko will be written there. You can visit @partiko blog to know much about it.

For you to accomplish this aim, you need to be a programmer or you can consult some programmers to help you out.

hope this answered your question?