Online comment platform Disqus , which lets you use a single profile across some 500,000 sites across the web, is launching some key new social features today. The first change concerns Disqus's global user profiles, which let you get an at-a-glance view of a user's recent comments. These are good for figuring out who someone is and to gauge the quality of their contributions, but before now it's been tricker than it should have been to access much data — you had to head over to their profile on Disqus.com to get more than the basics. Today's release changes that: clicking on someone's account name will launch a more robust popover window, which displays both the user's key stats (number of comments, homepage, etc.) and an activity stream, which includes a full listing of their recent comments and any posts they've made to their blog and other services they've connected to Disqus, like Facebook and Twitter