This is the Facebook colour palette, which is a monochromatic palette containing 5 colours.

Facebook Blue Facebook Blue
Hex: #3b5998
RGB: 59, 89, 152
Facebook Medium Blue Facebook Medium Blue
Hex: #6d84b4
RGB: 109, 132, 180
Facebook Lighter Blue Facebook Lighter Blue
Hex: #afbdd4
RGB: 175, 189, 212
Facebook Lightest Blue Facebook Lightest Blue
Hex: #d8dfea
RGB: 216, 223, 234
White White
Hex: #ffffff
RGB: 255, 255, 255

For more social media colours, see Social Media Colours – Hex and RGB Colours of the Web

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