Maggie,
I'd been a "paying" Ancestry.com member from 2002 to 2014 ... until I noticed that *their* database was returning my very own research notes, as VALID KNOW fact. What gave them away [to me] was, I had created a test (within my own set of profiles) to see if indeed the children could possibly be of another woman by [ age of the Mother at birth]; and I had set my "note" at the ending of every 'Place of Birth' I entered (Boise, Ada County, Idaho, United States [ Moms age].
I have done my best to remove every note, before my GEDcom, but even now, I come across it in another's set of profiles; and I can't help but wonder how they (Ancestry.com) pulled off, as much as they did.
Ancestry.com offers long time (semi-well versed) members access to *SOURCE IMAGES*, and members (free of charge to Ancestry) transcribe those records into the groups, that are later sent out as hints. (Yes, we're all human, there are typos, transpositions, & plain omissions in those *hints*)
When I first noticed it, I said something to another Ancestry member who had posted one of my 'hunches' as fact, in her tree; I was met with outrage that I would even consider the notion Ancestry hadn't done their homework - that's what made me realize that while "Public" trees (at Ancestry) were better for finding others in the family to work with, the 'Private trees' kept everything locked down to avoid others grasping &/or stretching the facts. It is too bad that you must be a member, to communicate directly with other members (within the program). Every ancestry link not attributed to their Forum, will not work (if you're not a member).
Which is a minor part of why I don't like links; they assume that the linked site will not change formatting, or disappear completely. Links use up bandwidth (which is why many sites request that you do not link to them directly).
https://en.wikipedia.org/wiki/Inline_linking and
http://altlab.com/hotlinking.html explain why we should bring the data here, posting it either in a profile or free space, & linking from there is always suggested.
I, myself have always preferred to have actual images of Census sheets, because everything on them is often not, on sites that "summarize" the information. Quite often when Gr Gr Gr Gr had a 1,000 acres, it would get divided among heirs, generation, after generation - resulting in brothers' & cousins' entire family groups residing in close proximity (and on the same sheet).
Soooo, anytime you see *place of birth [Moms age]*, just think of me waving at you, reminding that you may want to double check that data.
Debra