According to Reuters and international press, Google and Facebook have held low level takeover talks with Twitter, that was estimated, as value, to $10bn.
In December, Twitter raised $200 million in financing in a deal that valued it at $3.7 billion.
Twitter was created in 2006 and is one of the most popular Internet social networking platforms.
eMarketer estimated, last month, that Twitter, which doesn’t disclose financial information, generated an estimated $45 million from advertising in 2010 and is expected to generate some $150 million this year.
$10bn buys a lot of companies and, as Guardian reminds, Harley-Davidson, the 108-year-old motorbike icon, is worth just shy of $10bn (£6.2bn)