The Sailbook webapp provides for a good experience for Facebook in my use of it. One thing I like about it, better than Facebook on Android, is you can easily send and receive messages on it without needing Facebook's intrusive Messenger app. Missing features with Sailbook are lack of video chat, and lack of ability to view Live streams while they are being broadcast.
As for Whatsapp - support is lacking and much better options for messaging services that provide greater privacy are Telegram (using TELEports client), Matrix (using Fluffy Chat), and Signal (via Axolotl).
Best regards,
Steve Bereon