Data portability has been a big buzzword for the last couple years. Just about everybody has gotten in on the act, from MySpace to Facebook to Google. Even Yahoo has a universal login option.

An new data from commenting platform Echo suggests that the Yahoo ID is doing pretty well for itself (despite launching almost a year after the others). Echo allows commenters to post from a number of profiles, including Facebook, Google and Twitter—and Yahoo ID is the most popular choice:

Over a third of their logins use Yahoo IDs. Facebook sees a quarter and Google a little less. One in ten use Twitter and one in 14 use Open ID.

Facebook may face an automatic increase—or decrease—soon, however. Friday, Facebook announced a new initiative to automatically share your information with pre-approved sites participating in Facebook Connect. Usually, you have to login to Facebook Connect on a participating site in order to comment using your Facebook profile.

The new system makes Facebook Connect opt-out instead of opt-in—if you’re signed in to Facebook and browse to one of the pre-approved sites, they may get your information even if you don’t choose to comment. At the same time, Facebook says they’re working on finer privacy controls so you can limit the data shared with these sites.

What do you think? Will Facebook Connect see an automatic boost from this, followed by a serious drop once people figure it out? Does Yahoo have a chance with Yahoo ID?