Completely changing the image people hold regarding a company or a brand is extremely difficult. Effective marketing teams monitor and respond carefully to these issues. If you once had a thousand different links all coming from low quality websites, then this could now actually stand to hurt your SEO as it will just look like link spam. If you've been guilty of using these old practices, then you might consider using Google's Link Disavow tool. This phase focuses on using SEO data to make decisions about which pages hold the most value. Unskilled users distributed newsletters that looked like font catalogs, using every imaginable typeface and style.