Action Details
Requirements and how-to articles for Etsy's action:

Listing your products on shopping engines is a great way to expose your items to buyers who aren’t searching on Etsy. Participation in the Shopping Engine Ads is currently free for sellers.

You need this to get it done:

Enable Shopping Engine Ads
Make sure your items are eligible to be advertised on shopping engines, and enable shopping engine ads in the shop manager settings.
Etsy currently syndicates their listings to the following shopping engines: Google Shopping, Bing, Shopstyle, Polyvore, Facebook.
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How-To Articles
A list of useful links for you:

Etsy - Advertising & Marketing Policy
Etsy's official policy for advertising and marketing, which is part of their terms of use.
Etsy Help Centre - Shopping Engine Ads
Official information about setting up shopping engine ads for Etsy listings.
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