The San Francisco based startup Secret (that was founded by two former Google and Square employees) is getting tons of attention, followers and fans. In short, you can write anything that's on your mind, add photos or colors to the background and customize this content while being able to share it, free of judgment, and without attaching any of your personal information or profile to it.
If you take a serious look at the media world, there are only a handful of significant players. While it may be easy to define "significant" as a company doing interesting things, it's more practical to look at the media landscape. Last time I checked, no media company was behind the creation of Twitter, Instagram, Pinterest or any other new media darling du jour. My guess is that they'll be investors as soon as they physically can be.