There have been many many instances posted in RMN this year alone which tells the tale on whether snopes can be trusted.
Just do a search for posts with SNOPES in the article to get a clue...

Basically, it boils down to trust NOTHING with political overtones in it.

Stories which relate to urban rumors seem to fare better.

Snopes is a husband and wife 'team'. David and Barbara Mikkelson. http://en.wikipedia.org/wiki/Snopes.com.

Here are a few recent RMN posts to peruse.

http://www.rumormillnews.com/cgi-bin/forum.cgi?read=41394

http://www.rumormillnews.com/cgi-bin/forum.cgi?read=54612

http://www.rumormillnews.com/cgi-bin/forum.cgi?read=53763

http://www.rumormillnews.com/cgi-bin/forum.cgi?read=51046

http://www.rumormillnews.com/cgi-bin/forum.cgi?read=49033

The bottom line is:

These snopers live in Calif, in the SF valley. It ain't cheap to live there. Apparently neither actually works at a job, yet they support a website and spend lots of time there. Where does there funds come from? Interesting question.

Snopes gets Snoped....

Snopes is run by a man and a woman with no background in investigation using Google.
Snopes.com has been considered the 'tell-all final word' on any comment, claim and email. Once negative article by them and people point and say, "See, I told you it wasn't true!" But what is Snopes? What are their methods and training that gives them the authority to decide what is true and what is not? For several years people have tried to find out who exactly was behind the website Snopes.com. Only recently did they get to the bottom of it. Are you ready for this? It is run by a husband and wife team - that's right, no big office of investigators scouring public records in Washington, no researchers studying historical stacks in libraries, no team of lawyers reaching a consensus on current caselaw. No, Snopes.com is just a mom-and-pop operation that was started by two people who have absolutely no formal background or experience in investigative research.
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David and Barbara Mikkelson pictured above; are from San Fernando Valley of California. They started their website 'Snopes' about 13 years ago. After a few years it began gaining popularity as people believed it to be unbiased and neutral. But over the past couple of years people started asking questions when 'Snopes' was proven wrong in a number of their conclusions. There were also criticisms the Mikkelsons were not really investigating and getting to the 'true' bottom of various issues, but rather asserting their beliefs in controversial issues.
In 2008, State Farm agent Bud Gregg hoisted a political sign in Mandeville, Louisiana referencing Barack Obama and made a big splash across the internet. The Mikkelson's were quick to "research" this issue and post their condemnation of it on Snopes.com. In their statement they claimed the corporate office of State Farm pressured Mr. Gregg into taking down the sign. In fact, nothing of the sort ever took place. A friend of Mr. Gregg personally contacted David Mikkelson to alert him of the factual inacuracy, leaving him Mr. Gregg's contact phone numbers. Mr. Mikkelson was told that Mr. Gregg would give him the phone numbers to the big exec's at State Farm in Illinois who would inform them that they had never pressured Mr. Gregg to take down his sign.
But the Mikkelson's never called Mr. Gregg. In fact, Mr. Gregg found out that no one from Snopes.com had ever contacted any one with State Farm. Yet, Snopes.com has kept their false story of Mr. Gregg up to this day, as the "final factual word" on the issue.

What is behind Snopes' selfish motivation? A simple review of their "fact-checking" reveals a strong tendency to explain away criticisms towards liberal politicians and public figures while giving conservatives the hatchet job. Religious stories and issues are similarly shown no mercy. With the "main-stream" media quickly losing all credibility with their fawning treatment of President Obama, Snopes is being singled out, along with MSNBC and others, as being particularly biased and agenda-modivated.
So if you really want to know the truth about a story or a rumor you have heard, by all means do not go to Snopes.com! You could do just as well if you were a liberal with an internet connection. Don't go to wikipedia.com either as their team of amateur editors have also been caught in a number of bold-faced liberal-biased untruths. (Such as Wikigate and their religious treatment of Obama.) Take anything these sites say with a grain of salt and an understanding that they are written by people with a motive to criticize all things conservative. Use them only to lead you to solid references where you can read their sources for yourself.
Plus, you can always Google a subject and do the research yourself. It now seems apparent that's all the Mikkelson's do.

http://accuracyinpolitics.blogspot.com/2013/05/snopes-got-snoped.html