The Wall Street Journal reports that Twitter is set to undertake another private funding round, which could value the business at US$7 billion – the talks come seven months after a previous round, which valued it at US$3.7 billion. It was noted that by raising cash in this way, “Twitter buys itself more time to develop an advertising-based business that is relatively immature compared to its peers.” Separately, AFP reports that Twitter has bought analytics start-up BackType, which helps publishers measure the impact of social media use.