It's not the same thing, but I found my grandfather's family, a good friend of my mother's, and some distant relatives on the internet.
My mother was a small child in Germany during all of WW2. Her father was killed in Hungary during the war. She didn't know much about him - his name, and that he was a musician. Her stepfather was the "real father" she knew. He, too, died during the war.
I decided to find her father's family, as a surprise to her. I have no recollection of how I did it, except that I used a German search engine. I finally found someone who posted something that was a clue that he might be in her father's family. I contacted him, he responded, and my mother traveled to Germany to meet him and his sister. They were her first cousins. I used a translation service to contact her cousin, since I knew he was from the former East Germany, and a lot of older people from there can't speak English. Thank goodness, he could because he responded to me in English.
Another time, I found the woman who had been my mother's best friend when I was 10, and my dad was in the USAF, stationed in Alabama. Again, I used search engines and, following a clue, found her. She and her husband, and my mother, immediately started visiting each other again. She lived in Florida and my mom lived in Atlanta. They renewed their friendship for at least 5 years, before the woman died. They were both so surprised, and really enjoyed their time together.
Then I found a relative I didn't know about. I was trying to find out the name of my grandmother's father, who was supposedly a full-blooded Native American. Instead, I found a lady on Ancestry.com, who was looking for the same thing I was. I contacted her - she was in her 80s and very nice, a close relative of my grandmother's. She had set up a fake name and email address for her search, as I found out later. Through her, I found another relative (not so close) who lived in Washington DC. Both of them knew about this Native American, same as my family did.
Then I did a DNA test, and there was no sign of any Native American DNA, same with my kids and my half-sister. My extended family was not happy to hear that, and they still think they are all part Native American, and that 23andme screwed up. And maybe they are, maybe the genes skipped me. I know hardly anything about genes.
I wish my grandmother was still alive, for many reasons, but also so I could ask her about this.
I also wish I could have found out information about my paternal grandfather, but having scoured the internet many times over the years, I never found out anything about him. I knew his name because my father was a Jr.