Every website's ToS should include something like: "Screenshots of this website, quotes taken from our text content, and any references to our brand, domain, or web pages must include a search-engine-followable HTML link."
Because when other sites write about you/use your stuff, they *should* be linking, and it should be a ToS violation when they don't. Pointing an obstinate author of a piece that uses a screenshot of/quote from your site to said ToS can ease that link request conversation.