(Reuters) - Facebook Inc beat analysts' estimates for revenue on Wednesday, even as the world's largest social network agreed to pay a $5 billion fine over data privacy and announced a U.S. antitrust investigation.Shares of the company, which owns WhatsApp and Instagram, rose 6% to $214 in extended trading. They have gained about 55% this year.Monthly active users rose 8% to 2.41 billion in the second quarter, in line with estimates of 2.41 billion, according to IBES data from Refinitiv.Ad..