cross posting

okay here is what Multiply has to say about cross posting
first you have to set it up in your Multiply blog - has a little blogger clickable under a blank compose blog

Yes, we offer cross-posting (posting a single blog entry to Multiply and another blog site at the same time) between Multiply and three other blog sites:

1. LiveJournal
2. Blogger
3. TypePad

When you enable cross-posting, Multiply can automatically detect new entries you've written on one of these sites and post them on your Multiply site as well. And when you post a new blog entry on Multiply, we'll automatically post it on your LiveJournal, Blogger or TypePad site (unless you explicitly choose not to when posting the new entry). Even with cross-posting enabled, you can choose to prevent a specific entry on your other site from being cross-posted on Multiply. Just add the following code to your entry on the other site:

You can enable cross-posting the next time you import new entries from one of these sites. Just click on Post at the top of any page and select Blog, then select the service from which to import new entries and enable cross-posting for future ones.

If you've enabled cross-posting, you can disable it at any time by going to My Account and selecting Posting Options.