Various sources from the past couple years cite between $34,000 and $37,000.
More than two-thirds of the population of the earth makes less than $1,000 a year, so this shouldn't be very surprising.
Sniff test:
World pop: ~ 7,000,000,000
1%: ~ 70,000,000
Population of the US ~ 300,000,000
Median income in the US ~ $50,000
Still, that number doesn't seem accurate for the cut-off for the global 1%
2010 census has over 180,000,000 Americans over age 25. So assuming that there are people making more than $35,000 outside the US, this number still smells fishy...
Quickly looking at Wikipedia ( http://en.wikipedia.org/wiki/Household_income_in_the_United_... ) I see that the median household income is $50,233 and there are 116,011,000 households in the US. A quick googling shows there are about 316.1 million people in the US, yielding an average of 2.725 people per household. Dividing $50,233 drops our previous income figure down to $18,434.12 per person.