Twitter could be worth up to £7 billion as the company prepares to go public in 2014 reports guardian.co.uk.

The social networking site has been given its rough valuation by specialist financial research company Greencrest with findings based on trading in secondary markets.

There are rumours that Apple has shown an interest in acquiring Twitter, further increasing its estimated value and the study suggests that Twitter will start preparations to float the company by the end of this year.

News articles on forbes.com note that Twitter has recently made some changes to its management team to ready itself for public trading. It has also overhauled its picture application as well as ensuring promoted tweets are directed at the right users.

Max Wolff, an analyst for Greencrest was reported to have said: “Using the secondary market for shares to mark enterprise value is a very difficult and opaque process. It is a rumour-rich and special share class soup.”

He went on to say: “That said, Twitter is up since the Facebook IPO and is now valued at northward of $11 billion. This makes sense as growth in users and new monetisation efforts are both yielding fruit and pointing toward a good 2013 for Twitter.”