I continue to work at filling in my ancestral tree. Others who are doing the same work can be quite helpful because ancestry.com allows for sharing information and documentation. Part of the fun is discovering tree links with other participants in the DNA project. I've picked up a few previously unknown distant cousins, and the collaborations have been helpful on both ends of our communication. Along the way, we've even had a real life visit. Funny thing is that sometimes newly discovered cousins are easily recognizable as relatives. One "new" cousin is a doppelganger for a paternal-paternal great-grandmother I knew. She lived until I was 18-years-old, and I even have a studio photo of her hanging on a wall in our home.
One ongoing complaint is dealing with those who are lazy, careless or both in constructing family trees. They record information incorrectly or make misattributions because they don't pay attention to cross-checking info with documentation. Why is this bad? Because the incorrect information has a way of metastasizing as new researchers build trees.
Most recently, some guy who isn't a direct relative is building a tree that is bleeding over into my family through in-laws of his in-laws. Ancestry.com sent me a message that new info was available for a set of my great-grandparents via this man's tree. When I investigated, I found that the new info was purported photos of my great-grandparents that are circulating because this other researcher added them to his tree. The problem is that the photos aren't photos of my great-grandparents. They are photos of my great-great grandparents, and I know that because I'm the person who originally posted the photos.
I can see how the mistake occurred because this pair of my great-grandparents and the great-great grandparents share names in common for both husband and wife, including wife's maiden name. Some people who are more careful contact me to ask what's up with that, and I explain the first cousin marriage that led to this weird state of affairs. I also direct them to all the documentation needed to confirm this explanation.
Here's the problem. Some people will promptly remove erroneous information when contacted, and they're happy to so because they want to get things right. Others, like the person who is using photos from my family collection, simply ignore my requests to remedy the errors. I guess they don't give a shit about passing around false information. They just want to fill spaces in their tree. But then others make the same mistake.
I don't want to withdraw permission to view my tree because the collaborations with others are fruitful, but there is a downside to the open sharing among those who are more serious about the research.