DAILY DEALS site Groupon has filed for an initial public offering, hoping to capitalise on the biggest investor stampede into web start- ups since the dotcom bubble burst a decade ago.

Online gaming group Zynga is in also in talks to have Goldman Sachs Group lead its initial public offering and provide a credit line of more than $1 billion to help make acquisitions, said a person with knowledge of the matter.

Groupon filed to raise up to $750 million in its IPO, an offering which will be watched as a barometer of whether internet valuations have become too rich. In April, a source said a Groupon IPO could value it at $15 billion to $20 billion.

The filing did not specify the number of shares to be sold, the price range or the exchange. It also said the $750 million figure was preliminary and could change. – (Reuters)