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Here are the numbers for 2011:

• The total annual carbon footprint per monthly active Facebook user is 269 grams. To put this number into context, one person’s Facebook use for all of 2011 had roughly the same carbon footprint as one medium latte. Or three large bananas. Or a couple of glasses of wine.

• Facebook’s total energy use from office space, data centers and other facilities was approximately 532 million kWh.

• Facebook’s greenhouse gas emissions, also known as our carbon footprint from data centers, office space, employee commuting, employee air travel, data center construction and server transportation totaled approximately 285,000 metric tonnes of CO2e (carbon dioxide equivalent, which includes greenhouse gases CO2, CH4, N2O, and HFCs).

• Facebook’s energy mix was 23% clean and renewable, 27% coal, 17% natural gas, 13% nuclear and 20% uncategorized (energy that’s purchased by utilities on the spot market and can include any or all of the above categories).