I had at least 8 people playing it for the first month and no one plays it anymore after that month. My friends from school haven't even touched that game for months either...
And you guys?
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I have somewhere around... 80 people on my friends list? When Ghosts first launched, I think about six of them were on playing it regularly. Another four people who were infrequently playing it. Since then I only see one person infrequently showing that they play Ghosts every so often. So yeah... none of my friends really.