Twitter on Tuesday reported second-quarter results that easily topped Wall Street expectations. The social media service saw revenue surge 124% to $312 million, while posting adjusted earnings of 2 cents a share, compared to a loss of 12 cents a share in the year-earlier period. Advertising revenue grew 129% from a year ago to $277 million, with mobile ads accounting for 81% of the total. International revenue spiked 168% to $102 million, accounting for a third of total revenue.