Well, I think the answer is yes. Here is a fantastic example which was asked 4 years before on Stackoverflow:
Stackoverflow:
https://stackoverflow.com/questions/31633635/what-is-the-meaning-of-inta-1-in-python
Quora:
https://www.quora.com/What-is-the-meaning-of-int-a-1-in-Python
What is the probability of the exact same question popping up in both, verbatim? I’ll bet there are so many other examples. I’ll bet Quora is webscraping the questions in many cases elsewhere on the web.