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Data: Company filings; Chart: Axios Visuals

Facebook makes the majority of its revenue off of users in the U.S. and Canada, but its user growth in those countries has slowed dramatically. 

By the numbers: A Facebook user in the U.S. is 3 times more valuable than a Facebook user in Europe, 10 times more valuable than a Facebook user in the Asia-Pacific region, and 15 times more valuable than a user in the rest of the world. The U.S. is by far the world's most lucrative ad market, worth over $200 billion, per estimates from Zenith, a global media agency. China, where Facebook is blocked, is the second biggest, at $87 billion. Japan is a distant third at $43 billion. 

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Cities brace for Election Day chaos

Illustration: Annelise Capossela/Axios

Worst-case scenarios for Election Day: Illegal militias show up fully armed at polling places. People are intimidated from voting. Extremist groups launch violent protests that last for days.

Why it matters: Mayors are playing down the threats — projecting a "we've got this" tone of reassurance — but some law enforcement officials and people who monitor extremists are telling them to be prepared for anything.

Miriam Kramer, author of Space
12 mins ago - Science

The next environmental crisis could be in space

Illustration: Aïda Amer/Axios

An unexpected frontier is facing calls for new environmental regulations and cleanup: outer space.

Why it matters: Space junk clutters up orbits and poses an urgent threat to weather, security, communications and other satellites. Long-term, you can’t live or work in space if trash is literally slamming into you.

41 mins ago - Health

Axios-Ipsos poll: Trump's sickness makes him harder to trust

Data: Axios/Ipsos poll; Note: ±3.3% margin of error; Chart: Axios Visuals

Large shares of women, seniors and independents now say they're less likely to trust President Trump for accurate information about COVID-19 since he caught it himself, according to the latest installment of the Axios/Ipsos Coronavirus Index.

The big picture: Week 28 of our national survey has most Americans rejecting ideas that Trump has floated around hydroxychloriquine as a virus treatment, how herd immunity works or any imminent availability of a vaccine.