二0一0年九月二十七号的问题

 Again I will probably need to resort to some English but here we go...

 1) How do you say face book in  Chinese? My guess is .. . .  is that right?

 2) In this sentence 看见了没  what makes this a question?   Should it have a 吧 ?

 3) How do I use 嘛  without people thinking I used 吗 ?

 4) Why is 科幻片 not 科幻电影 ?

 5)  Is there a special food eaten on National day?