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It's from
[twitter](http://twitter.com/#!/itoi_shigesato/status/169661833395961856).

```

    hetusa: 福岡県筑後、羽犬塚から行方不明になっていた叔母(73才)が発見された、と知らせがありました。
    itoi_shigesato: よかった。
    hetusa: ありがとうございました
    
```

My feeling is that it says something like 'just so'.

Also, it common to respond to よかった with gratitude?
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2012-02-15T11:57:44.880
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question
words
What role does よかった play in this exchange?
`よかった` means that the speaker was glad that the lost person was found.

I'm not sure that `ありがとうございました` is a direct response to `よかった`, rather it's
expressing gratitude for the other person showing concern about the lost
person.
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2012-02-15T12:07:19.463
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よかった is used here to express a feeling of relief ( Thank goodness! ).  
Intonation is important for this use: ああ、よかった!

Some situations where you can use the expression:  
\- you lose the wallet but you find it  
\- nobody is hurt in a traffic accident  
\- the goalkeeper of your soccer team stops a penalty kick
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2012-02-15T23:27:20.910
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You would probably want to know that よかった is the accomplished form of
[良]{よ/い}い that you know from simple sentences like _いいです_. This word did not
came out of nowhere.
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answer