Facebook said Thursday it has begun testing a system for users to send messages to people outside their immediate circle of social contacts for a payment of one dollar, as the company continues to find new ways to capitalize on its popularity. In a statement posted online, the Menlo Park, Calif.-based social site cited research showing that "imposing a financial cost on the sender may be the most effective way to discourage unwanted messages and facilitate delivery of messages that are relevant and useful." Facebook says the new test is designed to route messages sent from outside of a network of contacts around the lower-priority "Other" folder on a Facebook page, and directly into a user's "Inbox"—for a small fee. Each message sent will initially cost $1, though Facebook plans to continue tinkering with prices. Read the full story at The Wall Street Journal.