Appnow (appnow.com) - a service where you can create, download and immediately post the app to App store and Google play from Facebook or VK groups. All information from groups is automatically synchronized.
And, you can:
- Combine FB and VK groups (one app for all subscribers)
- Add feed instagram (yours or appropriate by category)
- Select multiple groups (news, jokes, travel, etc.) and create one column
- Send push - notifications (more preferable than message)
- Add youtube channel to the app