Publicize failed auto-excerpt in Japanese

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I use publicize for Facebook. It works totally fine.

But if I forget writing “custom message”, very long text will be shared to facebook.

I guess it’s because Jetpack make auto-excerpt with word count in spite of character length.

In Japanese, people don’t separate words with space.

As a result, hyper long text(in many case, whole body text) will be shared to Facebook.

I tried to find the filter for this, but nothing found.

1. Please suggest appropriate filter for Facebook share text.
2. Fix auto-excerpt like WP Multibyte Patch does.

Thanks in advance.