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Here's the context:

So has gone the reaction of many to the news that Facebook is buying the mobile photo-sharing service Instagram[.]

Could "at" be used as well? I was taught that, when it comes to reactions, you should use "at": e.g. "I was surprised at the news", "I was shocked at his behavior", etc.

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I don't think so. It is possible to say react with, react like, react against and react to but the preposition at is imho not possible. – Em1 Apr 11 '12 at 8:24
Alright, so the verb "react" and its derivative "reaction" take the preposition "to", and that rules out "at". Is that right? – Giorgiomastrò Apr 11 '12 at 8:35
up vote 1 down vote accepted

The adjectives amazed and surprised collocate with at, but the noun reaction doesn't. The only instances you can see the preposition at next to the word reaction is when a certain condition is mentioned at the time the reaction takes place, for example "The reaction of the liquid at this temperature is..."

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That was crystal clear. Thank you so much, Irene. :-) – Giorgiomastrò Apr 11 '12 at 8:41

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