Hallmark Cards | 107,640 followers on LinkedIn. When you care enough, you can change the world. | Hallmark believes if you care enough you can change the world as we work to help create a more emotionally connected world in every life, every day. Founded in 1910 by a teenage entrepreneur with two shoe boxes of postcards under his arm, Hallmark today is still family owned and privately held. Headquartered in Kansas City, Missouri, and employing more than 20,000 worldwide, the company operates a diversified portfolio of businesses.