|RGB Values||(59, 89, 152)|
|RGB Percentages||(23.1, 34.9, 59.6)|
|CMYK Values||(61, 41, 0, 40)|
|HSL Values||(221°, 44%, 41%)|
|HSV Values||(221°, 61%, 60%)|
Interesting little tid-bit of information. Facebook uses blue because Mark Zuckerberg is red-green colorblind, something he learned in 2007. As he later explained "blue is the richest color for me - I can see all of blue."
If you're planning on using any of the Facebook assets - images, that sort of thing - you should probably spend some time browsing their brand resource center to make sure you're doing it right.
Facebook Blue has a hex value of #3b5998 which gives it an RGB value of (59, 89, 152). That makes it approximately 23% red, 35% green, and 60% blue. On the CYMK color model Facebook Blue is 61 cyan, 0 yellow, 41 magenta, and 40 black. It is also 221° hue, 44% saturation, and 41% lightness on the HSL color model and 221° hue, 61% saturation, and 60% value on the HSV color model. Facebook Blue is not a Pantone color, but it is close to Pantone color 5275. Facebook Blue is not a DIC color, but it is close to DIC 184s. Facebook Blue is not a web safe color, but it is close to #336699.