I think we're arguing semantics at this point, Felorin. You raise an interesting point, of course, but my retort would be that the word "great" is a modifier of the phrase "social experiment," meaning grand in scale or remarkable. While the projects you've mentioned (yours included) would certainly qualify as social experiments, TSO is set apart from them by it's multi-million dollar price tag and ambitious original design. Therefore, it is "greater," relatively speaking. This is not a judgment on the merits of any of the aforementioned online games, merely a statement of fact. Speaking in terms of scope, ambition and budget, TSO was the first "great" (although inadvertent) online social experiment.