While initially the idea sounds fantastic...then we must come to earth again and think hard...do we really want our messages to be able to be read forever with no way to remove them after 7 days? That is what the STEEM Blockchain is, essentially a FOREVER storage vault that may (or may not) reward us with STEEM/ SBD or SP along the way.
While the opportunity to get rewards for interaction (which the Tax departments could also find) we must think hard about our privacy and the issues that a public blockchain presents.