SEESAW, a San Francisco-based developer behind a digital portfolio app that allows teachers and students to document and share their classwork, has raised a Series A round led by LinkedIn CEO Jeff Weiner, according to TechCrunch. The company declined to disclose the funding amount. Founded in 2014, Seesaw boasts a big footprint—claiming usage in half of all U.S. schools and 1,000 paying schools and districts, according to the story.