Irish start-up firm Tapastreet hopes to use the World Cup in Brazil to showcase its technology, which captures geo-tagged photographs taken by fans and facilitates their use online, writes Trish Dromey.

Facebook’s stock price has risen after chief executive Mark Zuckerberg said he is addressing the missteps that have made it hard to reap the benefits of mobile advertising.

Facebook boss Mark Zuckerberg said he had not enjoyed seeing his company's stock pummelled on Wall Street this summer, but was relishing the opportunity to prove his critics wrong.