The videoconferencing company Zoom has been criticized for the privacy and security issues on its platform.

In a blog post on Wednesday, CEO Eric Yuan apologized for the problems and said Zoom wasn't built to handle the number of people now using its platform.

Yuan said Zoom now has 200 million daily paid and free users, up from 10 million at the end of December.

He announced a series of measures to help make Zoom more secure and said he'd hold a weekly conference to update people on the company's progress.

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Zoom CEO Eric Yuan has apologized for the videoconferencing service's many privacy and security issues, saying it was originally built to service businesses with dedicated IT departments, not millions of consumers.

Zoom has seen its usage explode since January as the coronavirus pandemic forces white-collar employees to work from home.

In a blog post published Wednesday, Yuan said usage had increased by 1,900%, with 200 million daily free and paying users in March, up from 10 million at the end of December.

But the increased usage has meant increased targeting by hackers and trolls and scrutiny from journalists.

Trolls have started "Zoom-bombing" meetings, dropping graphic content in video calls and even taunting people in Alcoholics Anonymous meetings.

Reports also emerged just this week that Zoom was not end-to-end encrypted as it claimed in its marketing materials and that the company had inadvertently leaked thousands of users' personal emails and photos. The firm was also hit with a class-action lawsuit accusing it of handing data to Facebook.

Yuan apologized for the security issues and said that most had been fixed.

"We did not design the product with the foresight that, in a matter of weeks, every person in the world would suddenly be working, studying, and socializing from home," he wrote.

"We now have a much broader set of users who are utilizing our product in a myriad of unexpected ways, presenting us with challenges we did not anticipate when the platform was conceived."

He added: "We recognize that we have fallen short of the community's — and our own — privacy and security expectations. For that, I am deeply sorry, and I want to share what we are doing about it."

Here are all the measures Yuan said Zoom is taking to make its platform safer: