Fans can pay about $4 to watch the concert on Facebook, or pay with 40 Facebook credits.
That's a bargain in comparison to tickets for the actual event, which range in price from $85 to $375 each.
Christina Aguilera, the Black Eyed Peas and Jennifer Hudson are just a few of the artists expected to perform.
Oscar-winning actor and singer Jamie Foxx will serve as emcee for the Oct. 8 concert at Cardiff's Millennium Stadium.
Jackson family members are split on their support for the concert, but Michael's mother, Katherine, said she will attend. La Toya Jackson will be performing at the tribute concert. In a statement released Tuesday, she said she wants to "celebrate Michael with his fans to perpetuate the importance of his legacy."
Janet, Jermaine and Randy Jackson said they will not attend because it coincides with the involuntary manslaughter trial of Dr. Conrad Murray.