ifttt.com or “if this then that” is a web service that bundles all of your favorite web apps together. It then performs actions from instructions you have given. Known as recipes.
What are recipes? Recipes are simple connections between products and apps. There are two types of Recipes: DO Recipes and IF Recipes.
It is alot easier than it sounds!
For example if you liked a photo on instagram you can tell ifttt to do a automatic save of that photo to your dropbox.
This kind of service will be very popular in our ever increasing connected world.
It is a free service and includes Dropbox, Feedly, Facebook, Twitter, Craigslist, ESPN, Foursquare, Google Calendar, Instagram, Google Drive, Gmail, Skydrive, Tumblr, Stocks, Bitly and many more!
Here is the full list of apps!!
Here is the about/wtf page aswell!