zarx on 15 January 2011
doesn't seem to include region specific google sites as alexia seems to list them separately. google.co.in (India) for example is 15th in the world so add in them and I don't think facebook is going to beat it in the near future though I wouldn't say never...
also they method they use seems like it could skew the results a bit considering they collect usage data though people using their browser toolbar...
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