Seattle social networking startup Blue Dot is scrapping its name and repositioning the service — now dubbed Faves.com.Users of the new site can create a personalized Web page populated with their favorite news topics. For example, a Seattle Mariners’ fan who also enjoys surfing and cooking could sign up to receive information about those specific topics from other users who have bookmarked related content. That puts Faves.com in direct competition with sites such as Topix.net, Digg and Stumble Upon. The concept also is similar to what Seattle’s SportsUltra is trying with its customized sports news service.