Integration of apps into Facebook can be very beneficial for developers. You will be able to integrate your app into the News Feed and also the notifications. The core technologies on Facebook are platforms such as Social Plugins, Graph API and Platform Dialogs.

There are three concepts behind building an app. If you have a good understanding of them then they will be easy to execute. They are:

Canvas Page this can be loaded into Facebook as an app. The language or tool to build an app must support web programming. Some of the tools used are Java, C#, PHP or Python. A Canvas URL which contains the HTML, Javascript and CSS is used to display the Canvas Page within the Facebook web page.
Bookmarks are used to enable users to easily navigate back to your app from within Facebook. Users can add the bookmarks to favorites which prioritizes your app. Bookmarks also show a counter that represents the number of requests for your app.
Notifications are meant to provide up to date interesting changes to content relevant to users. You can trigger a notification to users who may find it useful. There are two types of requests that can be sent.
User generated requests these are requests confirmed by the users actions and updates.
App generated requests these are requests that can be sent only to users who have authorized your app.
News Feeds are shown to users upon logging into their Facebook account. These stories can be an experience, a new app or a new game that they are playing. New experiences can be posted onto Facebook with photos or a video detailing the events of that experience. Your friends can share in that experience by looking at the...