After two months of testing, Facebook Gifts is rolling out publicly to U.S. users. TechCrunch predicts that Facebook could earn between $127.5 million and $1.02 billion per year with the social commerce product.

“It lets people choose a friend, often someone who’s birthday or wedding it is, and give them a real-life gift or gift card,” explains the post. “At first it only allowed a few users to access the beta, but then let the service grow organically so anyone who received a Gift gained the ability to give them. It dropped another couple tens of millions of users into Gifts in late November, and now is finally publicly available so anyone in the U.S. can give to other people stateside.”

Since the social network currently touts roughly 170 million U.S. users, the earnings potential is massive. TechCrunch maps out this potential based on number of users and an assumed average gift amount, and speculates that Gifts could account for 3 to 24 percent of the social network’s annual revenue.

“Basically, Gifts will complement Facebook’s advertising and gaming revenue but won’t replace them,” suggests the post. “If it made $510 million a year, that would be $3 per year in additional average revenue per user in the U.S. That would nearly double the U.S. ARPU from $3.40 to $6.40.”

Of course, if successful, these numbers could increase dramatically with an international release.