Its online payment system CitrusCheckout is processing about 1 billion rupees ($16 million) per month, and in July crossed the one million monthly transactions milestone.
To toast the occasion, Mr. Zuckerberg wrote a lengthy post on his personal Facebook page, calling the transaction an "important milestone" for the company.
He said: "We look forward to working with Tata Steel over the coming weeks to complete this hugely important milestone transaction.
To toast the occasion, Mr. Zuckerberg wrote a lengthy post on his personal Facebook page, calling the transaction an "important milestone" for the company, which has been eager to get a stronger foothold in mobile apps.
"Bill played an instrumental role in the separation of Motorola into two independent publicly-traded companies, as well as in our recent milestone transaction with Google.
"This transaction marks another milestone for Baidu to incubate new businesses with large opportunities and strong synergies with Baidu's core business, on the heels of iQiyi's public listing," Robin Li, Chairman and CEO of Baidu, added in a statement.
This milestone transaction will enable us to focus on providing the best travel products and services to our travelers," James Liang, chairman of the board and CEO of Ctrip, said in a statement.
Gavin Patterson, BT's chief executive, described the transaction as a major milestone for the company, combining the owner of the UK's biggest telecoms and broadband network with the country's most-advanced 4G mobile system.
"This transaction, the most significant milestone to date in our ongoing effort to repay taxpayers, also gives us greater flexibility to move forward with A.I.G.'s restructuring and focus on enhancing the value of our key insurance businesses, which will benefit all stakeholders.
"We view this transaction as another important milestone in achieving our desired financing profile.
