Google Inc. said it would revamp the setup process for its new social-networking service Buzz, apologizing to users for raising concerns about the privacy of the product.

In a blog post Saturday, Google product manager Todd Jackson said Buzz would no longer automatically subscribe users to follow the postings of their close Gmail contacts, a move that had spooked many users into believing Buzz was publicizing their private relationships. Instead, after reviewing users' Gmail contacts, it would only suggest people that users...