By Chris Isidore@CNNTechSeptember 10, 2013: 8:13 AM ET
NEW YORK (CNNMoney)
Twitter is on a #buyingspree.
The social media company announced late Monday it is buying MoPub, a mobile-focused advertising exchange, in its fourth major purchase of the year.
Terms of the deal were not disclosed. Published reports put the price at about $300 million or more, based an estimated values of Twitter's privately-held stock that is being used to make the purchase. Twitter's statement said that MoPub's technology lets mobile application publishers manage their inventory of multiple sources of advertising.