Yahoo Inc. said it would implement a "Do Not Track" mechanism across its global network by early summer amid growing concerns about online privacy.

The Wall Street Journal reported Monday that the Federal Trade Commission issued a strong call for commercial-data collectors to adopt better privacy practices and called for Congress to pass comprehensive privacy legislation. The agency also called on U.S. commercial data collectors to implement a "Do Not Track" button in Web browsers by the end of the year or to face legislation...