A method for performing activities on a web site is disclosed. A user's browsing activities on a web site are captured. The user's browsing activities includes affixing labels to web pages and filling out forms. The captured activities are analyzed for patterns. Rules for performing activities on a web site are generated based on the patterns. Further activities are performed on the web site according to the rules and content from the web site is fetched. The fetched content is used in various web service applications, including crawlers.