Where has the pressure come from to Twitter to make money as its sole primary purpose?

Came across a new discussion published by ‘David Prosser’, a critic for and article in The ‘Outlook Section’ of ‘The Journal’. In a way, I found it quite concerning, a tell tale example of showing how, sadly but predictably, social networking, specifically referring to ‘Twitter’ is disappointing some big investors because of its lack of money making. With reading the Professional Communications Reader, I am learning the how the key features of Web 2.0 tools are to aim to facilitate sharing between users in a stimulating and fun way. Ullrich also specifically states in his theory of Arcutecture Of Assembly, the beauty of the fact that Web 2.0 tools do not have to rely on businesses or governments to aid them financially or in any other way. So articles such as this one littered with quotes such as ‘….is Twitter worth £3.7 billion or £10 billion?’, ‘Has Twitter really shown us it can make three times more money than we had thought six weeks ago?’, its primary purpose of its emancipatory practices is being totally missed. Anyone else agree with me in saying Social Networking being given these money making expectation defeats its primary purpose?