WASHINGTON (AFP) - US authorities said all 50 states have joined a national web site that lists addresses and other details of convicted sex offenders. The states of South Dakota and Oregon were added last week to the registry, which "provides real-time access to public sex offender data nationwide with a single Internet search," the Department of Justice said in a statement. The online database includes more than 500,000 convicted sex offenders who are required to register their address with local authorities. The government-sponsored site "allows parents and concerned citizens to search existing public state and territory sex offender registries...