[FQL] Stream filter

Ref: http://wiki.developers.facebook.com/index.php/Stream_filter_(FQL)

• uid
• uid in the where clause must be the session user
• filter_key
• name
• rank
• icon_url
• 目前拿來分類 status, link, photo 的賤招
• is_visible
• 判斷這個分類是否隱藏於 "More" 之中
• type
• The type of filter. One of application, newsfeed, friendlist, network, or publicprofile.
• value