Yik Yak YouTube
It's been around for about a year, and since then the Atlanta-based startup has raised $73.5 million in venture capital funding from investors including Kevin Colleran, Tim Draper, and Sequoia Capital.
(Here's how it became a ~ $400 million startup in 365 days)
We've put together a guide to show you how to use Yik Yak, which has already wreaked havoc on high schools and colleges. It was live my last spring at Syracuse when I was a senior there. Now it has spread to 1,600 colleges across the nation.