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Wondering how mobile advertising has fared over the last year. Wonder no more, thanks to the Mobile Advertising: From Barcelona To Barcelona infographic from inneractive (it refers to the 12-month period between last year’s Mobile World Congress in the Catalan city, and the upcoming event).

Every second, one hour of video is uploaded to Google’s YouTube. That equates to a decade’s worth of footage every single day. Or, in 10 days, an entire video century.

The video-sharing website has lots more time-bending stats it wants to communicate. Which is why the Google Data Arts team has joined forces with digital production outfit Punk & Butler to develop a new website, onehourpersecond.com, with illustrations by Alex Eben Meyer.

Marketers view calculating return on investment as the biggest challenge to using social media, and a majority of them believe they cannot measure social media campaigns effectively, says eMarketer.

Social media measurement has evolved significantly in its short history, but the need to prove effectiveness is more important than ever, the research firm says. As marketing execs plan how much to invest in social media and whether to shift funds from other channels, they need metrics that show not only that their brands have a lot of friends, but that those friends actually affect the bottom line.

Social video will be the format of choice for planners with an eye on the long game, according to Unruly’s What’s Next For Social Video report. “The honeymoon for the 15-second pre-roll ad is coming to an end as advertisers demand better execution and cut-through and move budgets from push formats towards pull solutions – even pre-roll is starting to morph into an interactive multichoice medium,” says Unruly.

Leading Premier League team on Twitter? That would be Arsenal with more than 1.1 million followers on the 140-character channel, ahead of Liverpool with a mere 640,000 and Chelsea with 560,000, writes Steve Mullins. That’s according to the latest Premier League social media stats from Freestyle Interactive.

Men are more likely to use social media for careers/networking and dating, while women use it as a creative outlet, to get coupons/promos, or to give positive feedback, according to research from NM Incite. More men add friends based on business networks or physical attractiveness, and women are more likely to friend based on knowing someone in real life, or remove them due to offensive comments.

Google+ reaches 65 million global users, accounting for 5% of the global social networking audience. This early adoption bodes well for Google+, but whether or not the network can sustain this growth and a strong level of engagement among users will be better indicators of its success in the future, says comScore.

Despite significant differences in government, infrastructure, availability of access and cultural practices around the world, social networking is growing in every single market. The penetration of social networking sites ranges from 53% in China to 98% in the US, with 41 of the 43 markets individually reported by comScore seeing a market penetration of 85% or more.