Microblogging site and Internet sensation Twitter has acquired its second company in a month. On Friday Twitter posted a blog noting that it has acquired Cloudhopper, “a messaging infrastructure company that enables Twitter to connect directly to mobile carrier networks in countries all over the planet.” Twitter has been working with the small startup for the last eight months in a move it claims has helped it become one of the highest volume SMS programs in the world (Twitter processes close to a billion SMS tweets per month). Twitter said it has acquired Cloudhopper “to help us further grow and scale our SMS service.” Cloudhopper specialises in mass texting campaigns for advertisements and product promotions. Earlier this month Twitter acquired Atebits, creator of mobile Tweeting app Tweetie. The app was widely regarded as the best such app on the iPhone.

Twitter appears to be increasing its focus on the mobile space. Earlier this month it also unveiled details on its new plans to generate serious revenue via a ‘Promoted Tweets’ ad business, enabling marketers to pay to make sure their tweets appear as the first result whenever a user conducts a Twitter search.