I can only interpret "interactive" for blog technology:

*as having features allowing readers to communicate with the blogger in some way.. In addition to comments feature (for any blog), yes, wordpress.com have simple click features to "like", "rate" a blog post. One can also post simple polls...which I've done. Can get more complicated than necessary...

There are easy auto features also that don't require posting flickr, etc.....posting photos in a slideshow sequence,etc. That is interactive by allowing the reader to choose to click on a feature to enhance the reading experience.

Let us know how things progress, lrulan!