Abstract: A web-based method and system provides Internet users with expert services driven by the content that users browse. Wherein users browse the web with the said web-based client tool downloaded from the expert service system, the list of experts is consistently retrieved and displayed beside the content from the expert service system depending on the URL or the content. Experts use the same web-based client tool to attach to the content by means of domain, sponsored ads, search key words and URLs of the content. The user may select any rated expert to offer an assortment of content-driven expert services including chat, advice, demo, advertisement and product information, or even make a purchase. The content expert service system as well conducts periodical tasks to crawl Internet, cluster content by category, rank chat sessions and normalize URLs hereafter for the expert to browse and attach.