MySpace is still No. 1 in the US, but Facebook caught up to MySpace’s monthly traffic worldwide in April with 115 million visitors, PCWorld reports, citing research by comScore (the International Herald Tribune reports that MySpace has reached 118 million registered users). “Myspace has maintained similar traffic numbers for the past year, but Facebook has grown from less than 40,000 unique monthly visitors in April 2007″ to the 115 million” a year later. In the US, MySpace’s unique visitor figure for April was 72 million, compared to Facebook’s 36 million. Here’s TechCrunch’s coverage too. Meanwhile, the social-networking concept is quite the juggernaut: The European Parliament is developing its own social-networking site, The Telegraph reports, and the UK’s House of Lords is on YouTube.com, the Associated Press reports.