A lot of well-known bloggers will suggest submitting your posts to social content websites like digg, reddit and stumbleupon in a bid to increase traffic to your blog. However they never mention that there is a limit that these sites will take from a single source. After hammering my head against the wall for the past 2 days trying to submit one of my post to stumbleupon, I finally decided to ask about it in the help forum there.
We have a limit in place that prevents multiple posting from a single source. Having reviewed your pages, I consider it likely that you are encountering this limit.
One link to your blog, with a really great review, is what you need to get people to go visit it. Fill your pages with mirrored posts from your blog and you’ll actually find that it is more likely to work against you.
The most established, most visited pages here tend to be those which present variety to their visitors, and that is precisely what this limit is designed to encourage: variety. It also acts, incidentally, as a deterrent to spammers and commercial sites who might otherwise replicate their blogs (or business catalogs) on to the pages of SU.
So now I know.