Yahoo CEO, Marissa Mayer, has bought her 21st company during her stint at the web giant, and this time, it is social browser maker Rockmelt. The financial details about the deal have not been disclosed yet, but according to the sources Yahoo has bought the company for approximately $60-70 million.

Yahoo added that the four year old company will shut down its apps by the end of the month, but the company's technology will be used within Yahoo to bring in more traffic and revenue from mobile devices. According to a source, Rockmelt's CEO Eric Vishria will be joining Yahoo as Vice President of products for Yahoo's media properties and CTO Tim Howes will be joining as Vice President of engineering for Yahoo's mobile products. Rockmelt co-founders Tim Howes and Eric Vishria wrote on the company blog about the acquisition :"Yahoo and Rockmelt share a common goal: To help people discover the best content from around the Web."