Which, to me, seems to be stretching the definition of MMO a bit.
Yes, GimmeGolf does appear to be a multi-player online game, but massive? Do we have a threshold for that description?
In golf you play in groups of four, so at most you will be playing with three other people. Yes, you can be in a tournament against many other people, but at the end of the day is the tournament result any different from rankings on any number of other online games that don’t claim to be MMOs?
And then there are the things we tend to expect with an MMO; a persistent world of some sort, character customization, and character development over time. Aside from a record of your play, GimmeGolf does not appear to have much to offer in this regard.
Okay, I am biased and tend to apply MMORPG definitions to all MMOs. But NHL 09 clearly has those sorts of features while it feels like Skill Technology is really stretching the point.