For myself, the ways I interact with the 'gang of five' are:
Apple: Currently using an iPhone 6, though that's pretty much it at the moment.
Google: I find Google Search and Gmail indispensable, and haven't found a better alternative to Google Maps.
Amazon: Sometimes buy stuff on their site, but don't really interact with the company that much overall.
Facebook: Use WhatsApp and (sometimes) check Facebook.
Microsoft: Use a Windows 10 computer with Microsoft Office programs.
Based on that, I could probably drop Facebook and Amazon without too many issues, and finding an iPhone alternative wouldn't be too difficult either. However, I'm not sure I'd be able to easily escape Google or Microsoft, which is worrying in of itself.
Apple: Currently using an iPhone 6, though that's pretty much it at the moment.
Google: I find Google Search and Gmail indispensable, and haven't found a better alternative to Google Maps.
Amazon: Sometimes buy stuff on their site, but don't really interact with the company that much overall.
Facebook: Use WhatsApp and (sometimes) check Facebook.
Microsoft: Use a Windows 10 computer with Microsoft Office programs.
Based on that, I could probably drop Facebook and Amazon without too many issues, and finding an iPhone alternative wouldn't be too difficult either. However, I'm not sure I'd be able to easily escape Google or Microsoft, which is worrying in of itself.