%Dict%: <word> lookup the word.
%Find%: <user>,<keyword> find user's plurks containing keyword.
%Calc%: <exp> evaluate the exp.
%Tiny%: <url> give a tinyurl to the url.
%Gmap%: <addr> show the google map with the address.
%Log%: <source>,<num>,<filename> parse the source(http) and display most num-th user at filename