I once had a question about LSI keywords and being the only SEO at my agency, I had no one to ask except Twitter. Seeing that Bill was the expert on LSI keywords, I explained what I had read and asked him if I had explained it correctly. He took the time to answer my question with approximately 3 paragraphs and a link to a helpful article. It was so cool to get a response from him, especially considering my question wasn't super advanced, and I'm still a nobody in the world of SEO.