Steel first foray in social media was signing up for Twitter in 2010. She became popular on YouNow boasting 370,000 followers. Her popularity would spread onto other platforms such as Instagram and YouTube. Her Instagram contains a number of selfies and fashion fits while her YouTube video topics include lifestyle vlogs, fashion hauls, pranks, reactions, and more. In one series of videos, it documents Steel receiving a Brazilian Butt Lift. As of May 2018, she had over 952k subscribers on YouTube, 366k followers on Instagram, and almost 100k followers on Twitter.
Steel began dating Conner Bobay in 2016 and they have a joint YouTube channel together that is named Karlee and Conner. Their videos include pranks (some of which involve bodily fluids) and vlogs. As of May 2018, they had over 1.4 million subscribers.