Hosting the web sites of others on a computer server for a global computer network; creating and hosting on-line communities and electronic retailing web sites for others; designing, developing, and implementing computer software for others in the fields of on-line retailing, electronic mail services, real-time on-line chatting and instant messaging, web searching, address books, web page building and web publishing, on-line voice services, on-line message boards, and web site layout customization