"Different from," "different than," and "different to"

Excerpts from an article at Sentence First:

Different from is by far the most widely used and accepted form, different to is common in British English, and different than is spoken regularly in different varieties of English, including US English and BrE. All have their uses...

The voluminous Merriam-Webster Dictionary of English Usage (MWDEU) offers a historical survey of both usage and commentary, and concludes that all three “have been in standard usage since the 16th and 17th centuries and all three continue to be in standard use”...

Browsing the internet for opinion on the matter, we meet a mass of peremptory protest, which I must now counter-protest. Different than is not grammatically incorrect, nor can it be dismissed as a common grammar error or an eyebrow-raising gaffe, let alone one of the 10 dumbest grammar mistakes. It is neither a nasty and glaring error nor a flagrant grammar mistake that makes you look stupid or dumb. You may call different than abominable, but this is a matter of taste. You may call it ignorant, but you would be wrong, and unaware of the unfortunate irony.

These judgements, whether rude or neutral, newly acquired or long indulged, are pet peeves. They have nothing to do with grammatical correctness. Any suggestion that different than/to is grammatically incorrect, end of story, would have dissolved in a few minutes’ research or by consulting a single reliable authority...

Much more at Sentence First.