How it started

At the Republican National Convention, Clint Eastwood spoke to an empty chair.

Twitter: @davidcaolo

"I'm just going to leave this here."

Twitter: @dylanmatt

"Man, Obama's even getting in on #eastwooding"

Twitter: @delrayser

Pets are a popular take on many memes.

Reddit: Quickmeme.com

Eastwooding Game of Thrones

Instagram users join in

1,250 images and counting.

YouTube: the sampler

Clint Eastwood RNC Speech Highlights. http://youtu.be/Kb7wQe03ol8

Twitter: InvisibleObama

And from the other side's point of view: "Watch LIVE as my 50,000+ Twitter followers and I hold a rally at Met Life Stadium."

Twitter: @BarackObama

Obama is a master of social media and lost no time last night in posting his response to Eastwood's dig on his Twitter page.

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