Dan~, will you please get rid of the tube kitty! It's distracting and I feel sorry for it.--Please--
Disinformation is especially prevalent in politics. It's used by both parties. An obvious example is Palin's iteration of a "death panel" in the Health Care Act. It doesn't exist, nor has it ever. But some people still believe it. More insidious examples are when Congress people use numbers--particularly dollar figures--to 'prove' something, but use differing figures. There seems to be a lack of understanding among the voters, for example, about the difference between corporate taxes and personal taxes, or between taxes on the rich and taxes on the middle-class and/or poor.
I don't think sincerity has much to do with disinformation/misinformation. Every politician will sincerely believe in the 'truth' of her/his allegations. It's the 'proof' offered that needs to be questioned.
If a politician says, for example, "The proof is in the numbers" check the bases for those numbers, first, then check the numbers.
Half-truths are the worst, since they're only partially true. But how many people go beyond what they believe to examine a half-truth as a whole truth.
The world is the people in it. I really don't know how to use the internet as a tool against mediocrity.
"Be what you would seem to be - or, if you'd like it put more simply - never imagine yourself not to be otherwise than what it might appear to others that what you were or might have been was not otherwise than what you had been would have appeared to them to be otherwise."
— Lewis Carroll