How do I trust sources or answers on the internet?

[Jim]

Trust no one but yourself, until the source has been proven trustworthy.

Thumbs cannot be evaluated for trustworthiness since you have no idea who clicked what and how trustworthy THOSE people are.

While Wiki isn't trustworthy enough to use as a source for college assignments, I've found that the information is usually quite accurate.

And yes, an answer on yahoo can have 999 thumbs down and be entirely correct.