Irvine-based Local.com, which operates a network of local search sites, said today that it has upgraded the technology behind its sites. The firm said that it expects the enhancements to improve its search advertising relevance across its Local.com site and network. The company also said it believes its upgrades will increase organic traffic to the site. No details on the exact technology changes were given by the firm. Local.com said that so far, it has deployed the technology on its main site, and will roll it out to the rest of its sites through the remainder of the year.