Your Twitter feed is going to get even busier thanks to the microblogging service unlocking auto-playing video ads for advertisers. Starting today Video Website Cards are available to every ad-buyer. In limited beta tests (like the one embedded below; videos don't seem to work with embeds), Twitter has found them pretty successful, with a 200 percent higher clickthrough rate compared to the leading standard. So yeah, expect to see an awful lot more of these coming soon. Just wait until #brands start combining these with 280-character tweets. Suddenly, paying for Tweetbot doesn't seem like a horrible idea.