Deprecated - Social software and communities

I was wondering how i can keep track of particular people's posts?

Has anyone figured a way to enable posting of comments on a user's profile sort of like a "comment wall" on facebook? I'm using the bio module and have enabled comments on that profile type but they don't show up, I suppose I could dig around in the .php file of that module and add it in but I'm wondering if there is some other easier way to do this

I'm making a social networking site in Drupal, I'm almost done and its going well but I'm wondering if anyone has worked out a solution using any of the photo gallery modules to allow users to create their own photo galleries

I have search Google and Drupal high and low and cannot find anything on this. Is there a way to give Google and other search engines access to authenticated user content? So the content can be crawled and indexed but visitors have to sign up to get to the content?

I've searched for a day for this and can't find a previous thread that maps to what I am looking for; if there is an existing thread and I've just been a moron in my search terms, please let me know.

I am looking for an ability to have a user create an account on drupal as a 'micro-administrator' for his/her group, with the ability to create a profile for their company and then add additional accounts that are grouped with the company.

Is there a module for micro blogging or something like that?

Wordpress has something like that. There are simple and short entries for the blog and they are shown in a block. When you click on it, you can see the details of the entry etc.

I couldn't find another term for it. But probably you know if there is a module like this for Drupal