I have 3 web sites that cover different niches in real estate. I have a blog I write that I just had converted to an RSS feed that will appear on all 3 sites.
My question... will I lose SEO effectiveness by having the identical information on 3 similar sites? Would it be better to have one site with the "organic" content (RSS feed), and have the other 2 sites link to the blog on a framed page so that the information only appears organically on one site?
Personally I prefer not to serve the same content on two sites, although this ought not cause a problem with engines, and normally does not. Google, for example, would generally leave the best match of the three unaffected and hide the other two behind the "repeat the search with the omitted results included" link. This allows the content to be found, but without annoying users with the same content multiple times for a search.
If I wanted all three pages to perform well (due to HTML title or other things on the page) then I would definitely want to avoid dublicate content. This is because sometimes, an engine will devalue the URL for all searches, not only when the same content ranks on more than one URL for a particular search.
The first technique that popps into my head is to host the blog on one of the sites and include excerpts on the other 2 sites, where the 'read more' would click through to the hosting site.
(Sidenote: bear in mind that there is a strong school of thought that says that if your sites are so similar in theme that you want to run the same blog on all three, then you really only have 1 site, so it should all be under the one domain name to reduce your SEO/marketing efforts!)