This Map From Facebook Shows Where People Most Strongly Support Marriage Equality

If you logged on Facebook at all this spring, you probably saw many friends change their profile pictures to a red equals sign as a signal of support for gay marriage.

The social media effort, started by the Human Rights Campaign, saw 2.77 million Facebook users join in.

But a new look at the data from Facebook, highlighted by the Washington Post, shows that how many of those signs you saw depends on where in the country you have friends. There's a huge amount of regional variation in the willingness or inclination to publicly support marriage equality.

Generally, the coasts, Great Lakes regions, and college towns saw the most uptake, while the South and Great Plains were less likely adopters.

Here's Facebook's map of the regional variation. The darker the color, the more likely someone was to change their profile picture:

There's a large amount of variation even within major cities and metropolitan areas.

For example, Manhattan and the areas of Brooklyn and Queens close to it saw extremely high levels of adoption, while the Bronx and Staten Island had very low levels:

The west and northwest parts of Los Angeles were most likely to put up an equals sign:

Chicago has a north/south divide on the issue, with the northern part of the city significantly more likely to show support:

The San Francisco area, with the exception of the southern part of the East Bay, was largely very supportive: