Wikipedia is not, however, the only viral wiki. Wikis serve different purposes and are deemed useful to their community of users. Cunningham’s WikiWikiWeb, the world’s oldest wiki, is a compilation of computer programming techniques and design patterns. There are many niche wikis, including WikiHow, a general how-to instruction manual; Wikipedia Review, a type of business directory that allows enterprises to write about themselves; PlanetMath, a mathematical encyclopedia; MedPedia, a medical encyclopedia built by medical experts; Javapedia, an encyclopedia for programming in Java; and there’s the Philippine’s very own WikiPilipinas, a Web portal, directory and almanac for Philippine-based knowledge.