San Francisco-based micro-blogging company has followed up on its previous $20 million in funding with a similar sized round that has yet to be announced.

The Twitter report also says that it has entered into an agreement with one or more venture capital firms that place the company's value at $250 million.

A piece of quote from says that there is something in twitter, I suspect the micro-blogging service must have something up its sleeve, otherwise why would a venture capital firm reportedly dump $20 million into the company-giving it the $250M valuation?

A report from TechCrunch says that this could be due to Twitter's recent significant growth and additional future potential for continued growth, rather than an outright true current valuation at that level.

Twitter's last round of funding took place in June, when new investors Spark Capital and Bezos Expeditions invested.