I've got myself confused with what should be linking where. I ended up with an article being posted to my site three times yesterday so I've gone wrong somewhere.
Here's what I think I've done so far.
Articles to my main site go to Ping Kaching and get pinged and sent to social sites.
Different articles go to Posterous which links to my WP blog and to social sites. Do I link Posterous to my main site too? Everything on Posterous goes to PK to ping and to social sites.
My WP blog links to my main site. Everything on the WP blog goes to PK to ping and to social sites.
Ezine links to my main site and goes to PK to ping and to social sites.
Edited to say that something I've just posted on Posterous has gone onto my main site 4 times so I've clearly made a balls up somewhere!
I know that all URLs go to PK, but should I just be pinging them or should I be sending to the social sites? I'm a bit worried about sending duplicate content to the social sites.