While I do think it's unethical to publicly post anyone's whereabouts online for everyone to see, I think that it is equally just as bad to buy a resource like the one mentioned above and then turn it into your own money making bulletin board... He should have just developed a totally new fork of Twitter under a different name perhaps. Twitter is dead... Has been for a long time now...

At least everyone still has the ability to abandon it and move on to creating more useful places.