She has a Facebook account too.
http://www.facebook.com/pages/Ichimichi-Mao/181765701862648
Hate to burst your bubble, but if you thought that this Facebook page is actually Mao's, it's 99.9% likely that you're wrong. Just from looking around it, it's pretty obvious that this is a fanpage that someone created on Facebook as a tribute to her. Japanese media execs are known for being rather strict in how much their clients "expose themselves" to people, and as such, it's highly unlikely that she would have been allowed to have her own Facebook. The fact that there are "Mods" on/for this (ShinkenX and CP) site is also a pretty clear sign that it's just a fansite.
Yet even more signs that this is NOT a site that was actually made by Mao, and instead IS a fan's tribute page include:
1 - It's primarily in English. Unless she's secretly fluent in English, if Mao
did have/create her own Facebook page, it would be primarily in Japanese.
2 - I don't personally have a Facebook account, yet I was able to click that link and was able to pretty much see/access everything. As a actor/model/public celebrity, having an "open" Facebook account is the last thing that one would want, as it would mean anyone and everyone would be able to access all of her "personal info" that she would have had to put on the page when she registered.
3 - The "Photos" section has a LOT of magazine scans and TV screencaps of Mao and the rest of the Gokaiger cast...instead of actual photos that she should/could/would have taken with her cell phone or camera.
4 - In her "likes" list, she includes the TV-Nihon fansub group. Technically speaking, if Mao/her management/TOEI Entertainment found out about TV-N and what they do (i.e. take eps of their shows, and provide FREE English subs for them that people can download online), there's no way that they would be on her "like" list. If anything, they'd probably go after them because of the fansubs that they do.
EDIT: Really, the only thing on that Facebook that was actually created by Mao is her blog, which the Mods there (ShinkenX and CP) have provided a link to.