Don't post or share any information--especially Personally Identifiable Information (PII) of living people--that you wouldn't want shared when privacy policies change or company ownership changes--especially if it goes out of business and bankruptcy proceedings put your personal information on the selling block.
Now that I'm over 50, I've become particularly curious about my lineage. I didn't much care about it when I was in my 20s, 30s or 40s but I now feel a strong urge to learn about my roots. Am I distantly related to Lincoln or Gandhi or Dickens or Attila the Hun? Okay, Attila the Hun might be a stretch.