I just started a member blog and now I'm wondering how public it might be!
Can susan's forum pages come up in search engine results? Are the forums crawled by google?
Yes, and it's probably how you, and many others, found the site.

How many times have people been involuntary outed by someone finding their info on susan's?
That's why we put the following information in the TOS:
6. You should not give out personal information which may lead to you being identified, or contacted in person, by email or other means. If you chose to do so, then you also accept all accompanying risks. Aliases and the use of alternate identities, social media accounts, and email addresses are strongly encouraged.
Also from the TOS:
...this site does not sell or provide access to your personal information to third parties...
At the end of the day, this is the internet, and the internet never forgets. Be wise, protect yourself, and above all, think before you post. Even deleted material can be easily found in the various internet archive services.
Hugs, Devlyn