The virtual dating game
"We are all here because we are optimistic about the future," said Zuckerberg.
"We have real challenges to address but we have to keep that sense of optimism too.
Whats App may have lost its CEO, but it's gaining stickers and group video calls.
"I know it hasn't been easy being a developer these past couple of months," said Zuckerberg.
Ime Archibong, Facebook's head of platform, said the process will be slightly stricter going forward.
It is adding a limited translation feature that can translate English to Spanish and back for people chatting over Facebook Marketplace in the US.
Messenger is going to expand that feature gradually, Facebook said, with suggestions for more translations in the future.