Traditionally, at the beginning of each year Facebook founder Mark Zuckerberg takes on a personal challenge.
These have ranged from learning Mandarin, to visiting every state in the US, Mr Zuckerberg said: "Rather than having year-to-year challenges, I've tried to think about what I hope the world and my life will look like in 2030."
By then, he added, "we'll have the technology to feel truly present with another person no matter where they are, and scientific research will have helped cure and prevent enough diseases to extend our average life expectancy by another two-and-a-half years".
He also looked back to his own childhood, reflecting on how social networks need to refocus.
"When I grew up in a small town, it was easy to have a niche and sense of purpose. But with billions of people, it's harder to find your unique role. For the next decade, some of the most important social infrastructure will help us reconstruct all kinds of smaller communities to give us that sense of intimacy again.
"Our digital social environments will feel very different over the next five-plus years, re-emphasising private interactions and helping us build the smaller communities we need in our lives."
Mark Zuckerberg's past challengesMedia playback is unsupported on your device
Mark Zuckerberg did a 30-minute question-and-answer session in Mandarin
In 2018, after another bad year, such as abuse, hate speech and defending against nation state interference
His 2017 challenge - - sparked rumours he could be planning to run for president.
was his 2015 challenge
In 2010 he promised to learn Mandarin Chinese and a few years later conducted an interview showing off his skills
Other challenges have including running, learning to hunt and cook and becoming more confident at public speaking
He called once again for "new forms of governance", asking for governments around the world to establish clearer rules around what was and was not acceptable in online political marketing, among other things.
This week the social network announced that it would not be making any major changes to its political advertising policy, reiterating its view that such decisions should not be made by private companies.
It puts it odds with rivals Twitter and Google who have both pledged to ban political ads.
It has been another tough year for Facebook.
It has faced a series of hearings on issues such as privacy and misinformation, with Congress announcing in June that it would investigate Facebook and the big tech firms over anti-competitive behaviour.
over the Cambridge Analytica scandal.
as being "a half-baked mission". It emerged that he had spoken to only nine people in his quest to discuss the future of technology in society with "leaders, experts and people in our community". All were white and eight of them were men.