 Current chatbots are the descendants of Weizenbaum's ELIZA (see section 1.2), and are typically used (often with an animated “talking head” character) for entertainment, or to engage the interest of visitors to the websites of certain “dotcoms”. They may be equipped with large hand-crafted scripts (keyword-indexed input-response schemas) that enable them to answer simple inquiries about the company and their products, with some ability to respond to miscellaneous topics and to exchange greetings and pleasantries. A less benign application is the use of chatbots posing as visitors to social network sites, or interactive game sites, with the aim of soliciting private information from unwitting human participants, or recommending websites or products to them. As a result, many social networking sites have joined other bot-targeted sites in using CAPTCHAS to foil bot entry. 