Instagram is popular about two effects one is “InstantRetro Effects” that brings the vintage feel to your pictures.It is only necessary to load a photo / image on it apply effects and save in the gallery site Instant Retro. Instant Retro has a Facebook application and an extension for Google Chrome with the same functions (application of retro effect on the pictures).
Other is Tilt-Shift effect which fakes a shallow depth of field effect, throwing the foreground and background out of focus. When choosing a photograph for the tilt-shift effect, bear in mind that you want to give the impression of a miniature model. Miniature models are usually viewed from above so try and choose a photo with an elevated viewpoint. Buildings, roads, traffic and railways are excellent choices but make sure there is a reasonable wide angle of view.
If you want to build a similar App like Instagram, contact me now at email@example.com or add me on skype at jimmy.vinfotech