Each card "offers a snapshot picture of any blog. All you need is to tack the URL at the end of this address" (http://kinja.com/id.knj?url=blogsite.com), writes MicroPersuasion.
You can get all sorts of interesting info about your blog (or any blog):
- Snapshot shows similar websites
- Pubsub shows how many links a blog gets every day
- Check PageRank on Google. You can also check it on Live Pagerank or PageRank.net
- Latest Mentions