Web meshaps

Fulfilling a second major part of its promise to make the internal workings of its Web site more extroverted, Yahoo is opening the interface for its address book for outside use. The move could mean that Yahoo, struggling under business pressures but still a stronghold of Web activity, could become more tightly tied to others' Web services. For example, a programmer starting up a social networking site could use the interface to send invitations to a member's list of contacts stored at Yahoo.