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Facebook has issued me the following alert:

> Aさんが、Bさんがあなたとシェアした写真について「いいね！」と言っています

I think this is a translation of "A likes the photo that B shared with you."

Is it obvious what's being said? Why couldn't it be read as both A and B
liking the photo?
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2016-04-13T15:45:53.950
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2017-03-20T02:14:58.967
2016-04-19T20:23:49.980
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question
particle-が ambiguity
Is Facebook's use of double が grammatically unambiguous?
Actually, this kind of "double が" situation happens all the time. Sometimes
there's just no elegant way around it. In this case, Aさんは doesn't feel exactly
right because these notifications appear out of the blue with no surrounding
context. In cases where brand new information is coming in, が usually feels
better in introducing it. Imagine it sort of like an announcement of a radar
contact: "Sir! A meteor has been detected on the starboard side!" This would
definitely be が. The Facebook notification is very similar in feeling.

I admit that I too feel a tinge of worry when I'm forced to use this sort of
construction, but I've never seen a native speaker have any trouble
understanding these.

**Edit** : Sorry, I didn't answer your actual question:

> Why couldn't it be read as both A and B liking the photo?

If both people liked the photo, the sentence would be more explicit about
that. It would look something more like:

AさんもBさんも、Bさんがあなたとシェアした写真について「いいね！」と言っています。

On the other hand, if only B liked the photo that B himself shared, it would
like be simply:

Bさんが、あなたとシェアした写真について「いいね！」と言っています。

The fact that two parties are mentioned makes the reader expect that one of
them lives in a relative clause. So it is natural to expect that A is the main
subject of the sentence.
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2016-04-13T16:25:04.317
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answer
It is quite obvious. It's a bit awkward, but I'm not sure I'd call it a 'train
wreck'; there's not really a better way to say exactly that.

There's really no ambiguity - *XがYが cannot be read as 'X (subject) and Y (also
subject)' because you would say that in some other way, likely either XとYが or
sometimes (in more formal speech) X、Yが. Two case-marked nouns sound like two
nouns with separate roles - if there's only one role, there'll only be one
case marker.
CC BY-SA 3.0
2016-04-13T21:27:26.927
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answer