According to foreign media reports, micro blog Twitter announced on Friday that it has successfully invested $35 million, which will mainly be used for product development.

Biz Stone, Twitter co-founder of Biz Stone, said in her blog that the new round of investment comes from venture capital International Venture Partners and Benchmark Capital, the former invested $14 million, and the latter invested $21 million.

Meanwhile, Peter Fenton of Benchmark (Peter Fenton) will enter Twitter's board of directors.

Twitter has already raised $22 million, plus $35 million for the total of nearly $60 million.

Twitter was founded in 2006.

Last year, Twitter also rejected Facebook's offer.

Twitter said investors want companies to operate independently.

Despite the rapid growth of Twitter users, there has not yet been a clear business revenue model.

But Stone said that this situation will soon be changed.

He said: "we have enough strength to support the rapid growth of services, promote the development of Twitter, and will begin to develop products that can generate revenue."

Stone also said that Twitter will expand its workforce. The company currently has about 30 employees.