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you might get a reliable number if you try contacting the good people at AIM... although honestly I dont know if anyone would have numbers for this. They could track the number of downloads, but that doesnt necessarily reflect the number of users. they could track the number of screennames, but many people have more than one (i have ~4 i think) so that's not accurate either. they could track the average number of screennames in use, but that's not really accurate either since you can link screennames together.
long story short, i dont know if you'd be able to get an accurate figure for this sort of thing.
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