@Setanta,
Setanta : Adjectives are frequently used where an adverb should be used.
That would be because it is perfectly natural for native speakers to do so.
Setanta: Using Google to determine usage is a truly thoughtless thing to do.
Confusing second language learners with your ignorance on how language works is what is truly thoughtless. What Linlin discovered in Google is backed up by corpus studies in the LGSWE.
Setanta: You don't know how many of your search results are from non-native speakers.
That's easy to fix - "English only pages".
Setanta: You don't know the level of education of the people who are writing the usages you see in such a search.
You didn't know Setanta's level of education but regardless, you now know that he is woefully ignorant on how English really works.
Setanta: My advice is this:
Forget Setanta's advice. It's all too often completely worthless.