If this then that

The web service IFTTT (if this then that) is a fantastic free online service that allows you set up tasks that occurs when another specified task occurs. For example, if the weather reports that it's going to rain, you could set up an "IFTTT" recipe to send a text message to your phone to pack an umbrella. This services works with other popular online services including Craigslist, Facebook, Twitter, Dropbox, Gmail, Flickr, Foursquare, and many more. Below is a listing of some popular recipes currently listed on the site.

• Every time you are tagged in a photo on Facebook, it will be sent to Dropbox.
• Greet new twitter follower.
• Text to escape (send a text to have a phone call to escape what you're doing).
• Google Plus to Twitter.
• If I upload a photo to Facebook then also upload that photo to Picasa.
• Wake-up call.
• Save my e-mail attachments to Dropbox.
• Rent reminder.
• Get an SMS (short message service) alert before any event starts on your Google Calendar.

• Create custom recipes at The official IFTTT website