Facebook (rather inevitably) is now the worlds number one social network in unique monthly worldwide visitors.

The data released by Comscore (data in graph above) shows Facebook finally overtook MySpace in April this year.

Most of Facebook’s user growth, however, has been in international markets - MySpace is still dominates Facebook in the U.S. market, with 72 million monthly uniques. Facebook has 36 million monthly uniques, up from 23 million a year ago.

Sources: Comscore, Techcrunch