@Hawkee Maybe on a users profile page, below where it says "Hawkee's profile" for example, have something like, Hawkees latest update: then your latest comment on your profile. eg
Hawkees latest update: @jonesy44, Basically you can just post a comment on your profile. I've been considering combining the comments and activities into a single stream on the profile pages, but I haven't worked out all the details yet.