Couple Questions About Guest Posting

I don't.

You'll have more acceptances if you do, though: in spite of the lengths Google goes to, to publicize and clarify its differentiation between the two, there are still some blog owners who get confused between "duplicate content" and "syndicated content".

But plenty of blogs and other websites do accept guest posts that have previously been published elsewhere, every day of the week. People doubting this can see it for themselves, if they're willing to look. Many blog owners short of guest posts even re-publish articles from article directories like Ezine Articles, some of which have already been widely republished. (I say "even", but of course that's why article directories exist).

One way of finding niche blogs to which one can submit previously published articles is of course to look for the copies in EZA, and then use Google to find out where else they've been published. This obviously enables you to build up a list of blogs already known and proven to publish previously-published articles. (This, of course, is part of the answer to the people mistakenly claiming that blog owners accept only previously unpublished content.)

Nothing. It can happen. It's not the end of the world, and it's sometimes temporary anyway.

One way to reduce the chances of that happening is gradually and consistently to strengthen your own site's SEO by inexorably acquiring the initial indexation-rights for yourself rather than giving others unique content. The people for whom that's a problem are typically those who have given a collection of other sites previously unpublished content. Some have even submitted to large numbers of article directories material which hasn't previously been published and indexed on their own sites. Some of them end up with a site which can't even outrank an article directory (I know that's pretty difficult to imagine, after all the 2011 Panda updates, but it can happen). They often don't realize that "they did it to themselves". There's more discussion of this point here: http://www.warriorforum.com/main-int...marketing.html

Some do; some don't. But in general, the ones who mind (i.e. those who don't like links to squeeze pages) do tend, overall, to be the better quality, more valuable ones.

But if you find a super-looking blog which will accept only previously unpublished content, and you feel like writing something specially for them, which you don't publish yourself, perhaps because they appear to have a ton of targeted traffic which you really think you can't reach any other way, there's nothing wrong with writing something unique for them. I don't do it myself because I have enough to do without spending my time on "single opportunity articles" (and partly because I think it would also feel a bit weird to me to supply unpaid content to a site from which other people may well steal and re-publish it anyway: I'd feel almost like the only person not able to put it on my own site, which would leave a funny taste in my mouth! ).