Most of the recognisable logos we see everyday aren't the colour they are because the designers liked it. Colours are chosen very carefully to have a psychological effect on a person when they see it. Companies like Facebook will go through hundreds of shades of blue just to get the colour that has the most impact and is most recognisable.
Colours can also have a psychological effect and can even change the mood your in. Blue may be the most popular colour in the world when it comes to logos - especially in tech companies. Facebook, Twitter, Skype, IBM, LinkedIN and many more all use different shades of blue. The colour gives off an authoritative but calm effect.
Check out the infographic to get a better understanding of colour psychology in logo design.