Today’s the Big Day for the UK’s Prince William & Catherine Middleton (@ClarenceHouse).
How does royalty market itself? By following the same marketing principles as any other successful entity (including having its own YouTube channel). Attention to branding is key, as is the proper logo. For Prince William, his “logo” is his coat of arms
And Catherine now has one as well
Companies are taking advantage of the festivities to market themselves. For example, T-Mobile's viral video has more than 13 million views:
Read Ad Age's "How T-Mobile Won the Royal Wedding With Video Stunt."