Have you ever gone to someone's bio on social networks and had no idea what they do, what matters to them, or where to find out more? That is a common mistake made even by people who believe they know social media.
Taking the time to create a custom landing page for social media can pay off. Some go so far as the create separate landing pages for each social network.
Where you send your followers on social networks is part of your all-important personal branding. Social account bios are typically very short so you can't do much more than provide an image, a glimpse into what you do, and a link to where to find out more.