The and The claim the $1.2bn Digital Growth Fund recently launched by the investment bank is also interested in taking a stake in social games firm Zynga.
Twitter has recently been the subject of speculation about a possible sale to either Facebook or Google, with a figure of $10bn bandied about.
Some worry that valuations in the social media space have run into "bubble" territory – WPP chief executive Sir Martin Sorrell told the Financial Times today (28 February) that he was seeing "a number of excesses in terms of valuation".
Sorrell, when asked whether he thought Facebook was worth $60bn, said: "What do I know? I thought $15bn was too high, so I know nothing. I'd better shut up."
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