I've had vigorous discussions about Snopes with friends. I'm mostly conservative, I feel Snopes has a liberal bias. My liberal friends feel otherwise.
After much back-and-forth, what we found is this: - Snopes seems to be careful about printing only true things - But Snopes controls the narrative and decides which issues to fact-check. They seem to publish a lot more material that validates left-leaning opinions than right-leaning ones
At the time of last checking, Snopes had a single political fact-checker, she was a staunch Democrat.