Cron job not working right

Hi.
I am trying to get the remote publishing to work through email and i am nearly there but have a slight problem.

The cron is setup as instructed with the url in it set as :

/bin/wget -O /dev/null "https://www.bluefrogtoys.co.uk/index.php?option=com_easyblog&task=cron";

this works as long as i run the URL manually : https://www.bluefrogtoys.co.uk/index.php?option=com_easyblog&task=cron

then it immediately finds the email in the inbox and publishes it to the blog, what am i doing wrong that i have to run that URL first ?

thanks