Rob Lowe warns advertisers away from 'crappy online video'; Stan Lee partners with YouTube

More online video news from across the Web:

> This week's TV upfronts may see intense pressure on pricing from ad buyers--the worst in years. Story

> Speaking of which … actor Rob Lowe pitched online viewability standards for Fox at its upfront, warning advertisers to avoid buying "crappy online video" ads. Story

> Spotify may be laying the groundwork to get into the video side of the streaming business. Story

> Stan Lee is partnering with YouTube on an original content initiative called "World of Superheroes." Story

> Showtime will launch its own streaming service to rival HBO Now sometime in the coming months, CBS chief Les Moonves told investors. Story

> Amazon Studios is greenlighting six new kids' pilots for its upcoming season. Release

> Only 54 percent of online video ads are viewable by people, a new Google study finds. Story

> Netflix CEO Reed Hastings said 4K will be a contributing factor toward the demise of cable. Story

And finally… Advertising revenue worldwide from online video has doubled in the past three years, to $11.2 billion, an IHS and Vidiro study revealed. Release