post — record on the wall of a user or group;
comment — the comment to write on the wall;
photo — photography;
audio — audio recording;
video — video recording;
note — the note;
market — product;
photo_comment — comment to your photo;
video_comment — comment to the video;
topic_comment — comment in the discussion.
market_comment — review to the product;
sitepage page of the website on which you have installed the widget "like".