The popular
iPhone app Instagram lets you use some creative filters on your photos. The effects are popular and often used by
Instagram users. Creative director
Daniel Box made it easy to create the same effects with Photoshop.
He created a couple of Photoshop actions that mimic the effect. This way you don't need to use the app to get the effect and you can easily apply the effect on all your other photos. You can read
how to use these action files here. The
action files can be downloaded for free.

Source:
Petapixel