Google Talk last May claimed a paltry 3.4m subscribers worldwide, according to data from comScore Media Metrics.
The data is based on actual traffic from client computers to the service, so users who subscribed in the past but never logged during the month of May weren't counted.
Google's instant messaging service ranks at the bottom of the overall ranking, which is dominated by MSN Messenger/Windows Live Messenger (204m subscribers), Yahoo! Messenger (78m), AIM (34m) and ICQ (33.9m).
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