Lists featured this week include MyTwinn and Discount Dance Supply.

Half of all emails were opened on mobile devices (i.e., smartphones and tablets) in the second quarter of 2013, according to a study from Experian Marketing Services. However, consumers were more inclined to carry out their transactions on desktop computers. According to Experian’s “Q2 2013 Quarterly Email Benchmark Study,” 50 percent of unique email opens…

According to a Wall Street Journal story, Facebook’s Instagram will be ready to sell ads within the next year. The report quotes Facebook veteran and Instagram director of business operations Emily White, who says the photo- and video-based social network doesn’t have any short-term pressure to make money. Instagram, which just announced that its community…