The C4LPT blog was one way and didn't include much interaction. It was just a person feeding information about tools on the internet.
The level of interactivity on Prezi was two way but I don't think many people were using it that way, the interaction between people was mostly people messing with things on the presentation. Other than that it was just people trying to learn how to type and put their tools on there.
Twitter had a lot of interactivity, it was a little simpler than Prezi so people were more apt to look at others posts and their own. Twitter also included other people following each other, so more interactivity.
Blogger is two way communication, you can comment on people's post as well as people feed you information. It's not as interactive as Twitter though.
