Widget maker Gigya is offering publishers a new Gigya Socialize product that helps users invite friends to participate in a site, share content and even see what their friends are doing on a site through a newsfeed. Users can build friends lists so they can share their online travels. By partnering with Gigya, a Web site can have its assets included in the network of users who share their data. Gigya says it manages over 41 million contacts.