Trove currently uses Facebook Connect for registration. Since Trove is all about the user, it takes advantage of Facebook Connect to pull in your interests as outlined by your profile to help jump start the personalization. Facebook Connect also allows us to offer many more features that allow you to interact with your friends - we're excited to have some new site capabilities in the near future. We think having a social news experience is much more enriching.
We understand that there are concerns among some about using Facebook and encourage folks to check out our privacy pledge (written so normal people can read it): http://www.trove.com/privacy
Our plan is to roll out additional ways to login in the future, but we do not have a specific date yet. You can leave your email address to be contacted by going to Trove.com