Comment Box
Will it be possible in the future to have a comment box on the profile so members can leave messages and or graphics for one another, not just in status messages?
Recent Visits
Another cool thing would be to have a recent visits widget that shows you who has stopped by your page.
Last Login
Tells you when so and so last longed in to your website. Could be a member's widget or a back end widget.
Who's in chat widget?
Shows members on a member's widget who are in chat.
In the meantime for comments, you can add a widget from http://disqus.com and it acts as a comment box, shout out box, or small msg forum. You can add pics and links and @mention I believe, maybe even hashtags and it grabs your sites/profiles colors as soon as its able. You can subscribe to the comments, recommend the discussions and even vote up and feature comments.
Btw, I love the profile template and cover area of socibd, this kicks the b*lls off ning's design studio. Keep that, because its awesome. I can create new profile templates and covers for my users and feature them and even mix and match them.