The European Commission said the pledge addressed competition concerns. Reuters reported last month that the world's largest social network would gained conditional EU clearance for the deal.

"Our decision today will ensure that innovative rivals and new entrants in the customer relationship management software market can effectively compete," EU antitrust chief Margrethe Vestager said in a statement.

Kustomer, which sells CRM software to businesses so they can communicate with consumers by phone, email, text messages, WhatsApp, Instagram and other channels, would help Facebook scale up its instant messaging app WhatsApp, which has seen usage soar during the COVID-19 pandemic.

A buying spree of startups by big companies has triggered concerns on both sides of the Atlantic, with regulators worried about so-called killer acquisitions aimed at shutting down potential rivals before they are big enough to be a threat.

(Reporting by Foo Yun Chee)

By Foo Yun Chee