Twitter-watching site Gigatweet has recorded that the popular Micro-blogging site Twitter has already sent out over 10 billion tweets! But a new research found that only 16 of the top 100 companies in UK actively use their twitter accounts. It shows that most businesses aren’t taking advantage of this supposedly great advertising medium. One out of every five tweets refer to some sort of brand or products. That’s 1 billion product tweets already, and only 16 companies have used this new advertising trend. Although about 50 of the top 100 companies have already signed up for twitter, it was only to prevent cyber-squatting.