Facebook for Android (and re-signed Messenger) with some UI elements removed:
- Follow-ups
- Article chaining
- People You May Know in notifications
- Marketplace tab
- Video tab
- Various non-useful suggestions
- Instagram up-sells
- Update nag screen
- Instant Articles email subscription upsell and article chaining
- Group invite upsells
- Ads and the like

All modifications are done manually via reverse engineering. Most modifications are done by directly patching the DVM bytecode by hand (others involve manually updating resource definitions).