Facebook's trouble worsens with New Zealand mosque massacre live streaming

The shares had their worst day in more than two months Friday, falling 2.5 per cent to close at $165.98

Facebook Chief Executive Officer Mark Zuckerberg has had a very bad week, even in the context of a very bad year.

The week of bad news actually started March 8 with a proposal from U.S. senator and presidential candidate Elizabeth Warren to break up the company. Then there was the longest-ever outage of Facebook’s social network and services, which almost overshadowed news of a criminal investigation into its data-agreements with other companies. Facebook’s technical glitch was resolved just in time for it to post the departure of two key executives, including the one closely linked with the company’s most iconic product.