 The most well-known tool Rogers has developed with his colleagues is the Issue Crawler, a server-side Web crawler, co-link machine and graph visualizer.It locates what Rogers and colleagues have dubbed “issue networks” on the Web – densely interlinked clutches of NGOs, funders, governmental agencies, think tanks and lone scientists or scientific groups, working in the same issue area.Unlike social networks, issue networks do not privilege individuals and groups, as the networks also may be made up of a news story, a document, a leak, a database, an image or other such items.