LinkedIn makes serious moves towards business propositioning. In it’s latest among social-media companies, LI which have been increasingly focusing their efforts on advertising is competing with Twitter and Google to capture the business advertising space. Twitter also in June said it agreed to buy TapCommerce, a mobile-advertising technology firm, and has been expanding the ability for companies to sell products within tweets. Facebook as well has expanded advertising options for mobile app developers. And Pinterest has begunoffering advertisers the ability to promote content on its site as well.