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If this, then that is an online service that allows you to set up channels with a trigger and an action. The entire philosophy behind it is that it should be very simple to use. It utilizes the APIs of various online services, Flickr, Twitter and Facebook to mention but a very few. When something happens at a predefined website or the API of an online service, it performs a prespecified action. In other words; If this [happens], then [do] that.
A very nice feature on the site, is the fact that you can share any channel you have made, as a recipe, so that people can use it themselves. The service is free, and looks to be very useful. I have already created a few of my own, as well as adopted recipes of others.