How common are men-women friendships on Facebook?

is that the inverse of the Muslim belt or is it an unrelated coincidence?

Ah yes, the very reliable scale between known extremes "Not Common" and "Very Common"

This map was brought to you by fuck Oceania

I mean !mapswithoutnz@lemmy.nz is a thing, but world maps without the entity of Oceania, that's new.
Collective punishment this time!
Those poor Austrians can't take a break
The entire Pacific rim you mean.
- The Atlantic is mostly missing, too (Brazil is directly south of Liberia). It's clearly a map made by Indian Ocean supremacists.

interesting how the DDR is visible

Damn, that’s a very close visual match with the former border, not just a blob. I would have expected it to bleed over more into adjacent areas or shrink in others.
- The former DDR is actually shockingly visible in a lot of maps of Germany. Electoral voting preferences (especially looking at AfD, die Grunen, and die Linke), various economic indicators, average size of farms, vaccine rates (data I'm seeing is from 2009, may or may not still be true today. This is actually one of the few indicators where the east wins), religion (particularly non-Christian).
  This article shows a bunch of factors.
  As does this video.
- That could easily be the result of poor geolocation of residents (we know you're in the country but we can't narrow this down to a zip code).
  Also, not clear at all how many of these accounts are bots. A country saturated with the equivalent of online phone banks could easily tip the scales one way or another simply based on how they invent/associate accounts.
Its visable on a lot of maps. Really interesting
This phenomenon is called a phantom border, and Germany is not the only example (but one that is really striking on lots of maps). Poland is another example, as are the Southern US.
- You can even get it within a single city. Sydney's "Red Rooster line" is a well-known example here in Aus.
Also interesting how it is higher than in the western German part, despite the lower relative female population in the eastern part.
- To my knowledge (as someone from former West Germany), East Germany was ahead with incorporating women into the job market. Presumably, that is still the case. So, it could be that the friendships came to be from working together as colleagues...
- That may just be the cause then? The difference in relative population? Since we don't know from the graphic what the numerical foundation is, it might be sometime that skews toward the "more common" side when there's just less women in an area.
It's visible on basically every map. It's crazy

This map makes me uncomfortable. It looks like Neo-Pangaea is coming together.

Now, I realize what I find especially strange about this map: The Atlantic ocean is slightly narrow. Greenland is missing as well.
- At least NZ doesn't have to be alone in being left out, Japan, Australia, both Koreas, a good chunk of China, as well as Alaska have joined them in being ignored on this map
- Are you sure your problem isn't just because the map is muted?
- This time they took “no data” seriously.

please consider choosing colorblind friendly colours :) the colorblind community says thank you.

Given that Scandinavia is lower than elsewhere in Europe, I’m wondering if that’s an artefact of them looking at absolute numbers rather than opposite-/same-sex friendship ratios, and Scandinavians being the stereotypical depressive introverts

Is this pure Facebook friendship or is this controlled for family ties?

Just saying gay people would skew this result

Edit: I should say: the freedom of gays to live their lifestyle, which means gays can create communities and build their friendships that way.

Me, an East German, pointing at West Germany:
- It’s incredible in how many ways the division still shows up culturally 30 years later. Was there something in the GDR that fostered intersexual friendships?

What is going on, culturally, in the blue countries?

I have west African friends. They are horny bastards.
seems maybe degree of religion affecting policy?
- Probably more sexual repression results in hornier friend requests.
- Largely secular France and England have fewer intersex Facebook relationships than heavily Catholic Mexico and Brazil, because Catholics are encouraging it?

I wonder if the study and data controlled for people's parents being on Facebook.

I only joined FB after a girl told me all my friends (M and F) were there lol.

That's just the multipolar world kicking in!