comScore Media Metrix released its top 50 web properties for the month of June. It's no surprise that Google sites remain on top with Yahoo and Microsoft in the second and third positions respectively.
Facebook has moved up 2 positions to number 6 though, giving the social network its highest ranking to date. Twitter actually just made its first appearance on the list, coming in at number 46 with 20.1 million visitors.
comScore released a list of the top fifteen Web properties earlier today, and there are some very familiar search-related names in the first three positions. Microsoft's sites lead the way, with both Yahoo and Google trailing behind, according to these September rankings.