nope they usally dont work
submit them manlully for full effect from seacrch engins.
really you only need to submit to smn , google , hotbot ect.. (all the really big ones) to get on yahoo just submit to google (yahoo use googles database )
THE MOST IMPORTANT IS
GOOGLE.
85% of seachers use google and also other search engins use google to really about 90 - 95% use google.
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