You can't, there is no setting that you can write in Japanese on Facebook. You can type in the Japanese writing system by changing your settings on your computer.
If you're on Windows 7, here's how you do it:
Go to Control Panel->Click on Region and Language->Click on Keyboards and Languages->Click Change Keyboards->Click on Add-> Scroll down and find Japanese(Japan)->Click on the '+' sign->Click on the '+' near the word Keyboard-> Check Japanese and Microsoft IME->Press OK->And then press OK again to save changes.
It should appear at the right hand corner or on the area where the clock and date is. Open it up if it's not open, it should be labeled as EN. Click on Japanese. Click 'Show Language Bar'. Just play around to figure how it works, or you can search up Microsoft IME pad. If you're not on Windows 7, just search up 'How to change language to Japanese for' and then add Mac or whatever you're using.
Of course, you have to know how to read and write Japanese for you to use it properly.
I hope this helped!
年表 (nen pyou) But if you mean a Facebook timeline, it's タイムライン (taimu rain)
De Facebook
how to say "editor" in japanese
I think "on facebook" is right, for it's a website.
To say old Japanese illustrations in Japanese, you say "Mukashi no Nihon no irasuto".
Bonjour Facebook.
we say Nakagawa if we want to say inside in Japanese.
you shouldn't be posting your facebook on here ._.
メロン is how you say melon in Japanese.
To say tennis in Japanese.........テニス
フライドポテト is how you say it in japanese'
Terekineshisu is the word for telekinesis in the Japanese language.