A double rainbow, live-tweeted

The famous #Boston #rainbow, as seen from the Boston University bridge.

Derrick Z. Jackson/Globe Staff

The famous #Boston #rainbow, as seen from the Boston University bridge.

Social media have proven to be a useful tool for Boston, in good times and bad: a way to share information after the Boston Marathon bombings, to comment on political debates in real time, to collectively emote during sports triumphs and defeats. On Monday night, it served another purpose: Group appreciation for a natural wonder.

When an enormous double rainbow appeared over the Boston area after a powerful thunderstorm, hundreds of people — or, quite possibly, thousands — took to Twitter, Instagram, and Vine to share the images. (One wise observer posted a photo of people in a city street, all holding up their smartphones to the sky.) Some people took the rainbow as a sign that the Bruins would win. Others declared it a good omen for concert performances, the MassChallenge competition, or the neverending quest for pots of gold. Whatever the interpretation, the resulting photos and videos, many with Boston’s architectural icons in the background, make up a lovely gallery of local pride. It was a spontaneous outpouring of community, and a reminder that once in awhile, we really all do think alike.

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