Twitter, Inc has been valued at close to $10 billion by one of its largest investors, which is up around 10 percent from the last serious estimate, but down about the same amount from the last time crazy numbers were being thrown about.

In its latest filing, GSV Capital Corp. revealed that they own 1.9 million shares in Twitter with a total value of $35.2 million, or $18.50 per share. Based on an overall (estimated) share figure of almost 530 million, this prices Twitter at a heady $9.8 billion.

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While speaking at the Web 2.0 Summit in San Francisco yesterday, Twitter CEO Dick Costolo revealed some new and interesting stats about Twitter, including a huge leap in daily tweets sent on the platform, how the iOS 5 integration on Apple’s iPhone has boosted signups, confirmation of Twitter’s heady valuation, and a lot more.

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It seems like each and every week we read reports of the staggering valuations of the major tech companies, many of which are in the social space.

Twitter, which has yet to turn a profit and hasn’t demonstrated a viable long-term business plan, was recently priced at $8 billion. Groupon’s $20 billion-plus valuation has been described as fiction. LinkedIn has already gone public and are trading around $110/share – over twice their $45 pricing. And Facebook is rapidly heading towards a $100 billion IPO. Maybe more.

So here’s the big question: are we in the middle of a tech boom… or facing the mire of another tech bubble?

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A recent auction of Twitter shares on the secondary market has now raised the value of the company to $7.7 billion, doubling the $3.7 billion valuation made in December of last year.

Says Reuters:

Investors have agreed to pay $34.50 a share for Twitter in the auction conducted by Sharespost, an exchange for private company shares that announced the news on Friday.

Based on the 223.7 million estimated fully diluted shares of Twitter listed by Sharespost on its website, the deal would suggest a valuation of roughly $7.7 billion.

The Twitter auction, which Sharespost said was oversubscribed, involved 35,000 shares of Twitter’s Series B preferred stock, Sharespost said.

Recently Twitter was valued at $4.5 billion after rumours of interest from J.P. Morgan’s Digital Growth Fund, although that story has since been discounted by Biz Stone. Still, this latest auction has completely surpassed that number and Twitter is now closing in rapidly on the $10 billion figure that was being touted about when Google and Facebook were also rumoured to be ‘interested’ last month.