There are dozens of various photo and video editors, offering a wide range of services, including the social network option.
The Instagram sharing app system on iOS consists out of several functions which include:
- Authorization via email or Facebook account
- User profile settings and information + notifications
- Image/video sharing and editing (using various filters/ layouts/ settings)
- Newsfeed
- Direct - in-built messaging chat (added in 2013 in order to contest with Snapchat-like messengers)
Also, you should pay attention to these cornerstones of photo-sharing app:
- The Post
- The User
- The Message
- User-generated Content
- Streaming
- IGTV
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