Rainbow colour looks a bit cheap imo - for Google, because all its services are free for consumers, it plays fine. If I'm starting a social media company thoug

Rainbow colour looks a bit cheap imo - for Google, because all its services are free for consumers, it plays fine. If I'm starting a social media company though, I probably wouldn't want to venture out too far away from blue - simply because it's the easiest way for users to associate it as a mainstream social media company, i.e. alongside the Facebook-Twitter-Linkedin-Foursquare league, unless you are competing head on with any of these big four. I know this is a cheap strategy, but it also makes it cheaper for you to establish yourself in the market. Or, just pick your favorite color, much easier and you'll always be comfortable with.