The program aims to protect elephants and black rhinos in East Africa.
A legal complaint accuses Facebook of failing to implement internal controls to stop criminal activity from overseas traders.
"Esmond was one of conservation's great unsung heroes," Save The Elephants founder Iain Douglas-Hamilton said.
He reportedly has run his illegal business for more than a decade.
The tusks were left unclaimed at the airport for more than two weeks.
Poison is becoming the weapon of choice for poachers in Zimbabwe, where the elephant population has fallen by 10,000 in the past decade.
Demand for "white gold" has taken the elephant to the brink of extinction.
Those trying to stop the ivory trade can learn from people tackling drugs trafficking.
The African country says it needs to sell its ivory stockpile to raise money for conservation.
The event is designed to raise awareness about the poaching epidemic of African elephants.
More than 20,000 African elephants were killed for ivory in 2013, and Thailand imports a lot of that.
The black market wildlife trade is growing—as is the stock at the Rocky Mountain Arsenal.
Damning report highlights visits from Chinese president and naval delegation as 'surges in business' for local traders in illegal ivory
A report from the Born Free Foundation says that the ivory trade is conducted through as few as 200 shipping containers