Common B2B online presence mistakes include focusing on features over customer outcomes, using generic messaging that doesn't differentiate, neglecting mobile optimization, having slow-loading pages, lacking clear calls to action, and failing to update content regularly. Many B2B companies also make their websites too complex with confusing navigation, bury social proof, and don't address buyer objections proactively. Other frequent errors include ignoring SEO, not tracking user behavior to optimize conversions, and treating the website as a static brochure rather than a dynamic sales tool that continuously improves.