Twitter - allows for some interaction, but limited on actual site. Most things are links of outlets to different sites because Twitter itself is pretty basic.
C4PLT - did not have much interaction or feedback. Was just basically a directory of all different tools for someone to use.
Prezi - very high in interactivity because any member of the group can edit anything they want. Has visuals, links to videos, photos, other sites, etc. Most other sites that are based off of Prezi have a fair amount of interaction as well.
Blogger - allows for a lot of interaction, and can focus more on a specific topic. Each blog is usually dedicated to a single topic so those with similar interests can follow it.
