In their Manual of Style,
Wikipedia warns online contributors
not to use unsupported attributions such as
“… some people say,
it is believed,
many are of the opinion,
most feel,
experts declare,
it is often reported,
it is widely thought,
research has shown,
science says,
it was proven …”
Wikipedia calls these “Weasel Words”
and attaches the following image:
Am I Making This Up?