Facebook interest lists are a bit like Facebook lists. In Facebook lists, you make groups and monitor people or pages through those groups. But in Interest lists, you can add people, pages, or subscriptions under one list, and monitor updates via those lists.
Not only is this a great way of organizing your news feed, it also give you the option to share your interests with other people. You can set your lists public or private. Only you can see he lists you designate as private, while public lists can be seen by anyone. People can then subscribe to your lists.
You may not have realized it yet, but this is another way for marketers to benefit from social media. And since most bloggers also market their blogs on social media, they will find this tool very useful.