The Twitter Inc. (NYSE: TWTR) initial public offering is almost upon us, and investors and analysts have fingers crossed for a smoother ride the Facebook Inc.’s (NASDAQ: FB) shaky IPO. As we pointed out, Facebook is likely to continue to be Twitter’s biggest challenge. But is it too soon to wonder what the next big high-tech IPO will be?

Twitter and Facebook, like other successful Web companies such Amazon.com Inc. (NASDAQ: AMZN), Google Inc. (NASDAQ: GOOG) and Yahoo! Inc. (NASDAQ: YHOO) have come out of the United States. An article over at Marketwatch suggests that the next wave of tech IPOs may come from the United Kingdom.

King.com makes the hit game Candy Crush, and it already has begun filing for an IPO. It was founded in 2003, and the company is estimated to be worth as much as $7 billion. King.com has become the top games supplier on Facebook, a position once held by Zynga Inc. (NASDAQ: ZNGA).

Payday lender Wonga is another likely candidate. It was founded in 2006, and last year it earned $136 million. Despite being in an unpopular business, it could be worth at least $2.4 billion if it goes public.

London-based game company Mind Candy and Shazam, the maker of the popular music app of the same name, are also mentioned as likely candidates.

One big U.K. Internet company success is Asos, the online fashion retailer that now has a market value near $7.5 billion. And beyond U.K. shores is Rovi Corp. (NASDAQ: ROVI). The Finnish company makes the popular Angry Birds games.

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