Here is a Preview URL for this post.
http://blogging.nitecruzr.net/b/post-preview?token=yV1fKDYBAAA.ySUB0XKSvMXVATQkgsbJpQ.vf2Wk6Ed_TXX54XVpLn3uA&postId=1855542079708688719&type=POSTIf you're interested, click on the link. Does it show you anything? How about another?
http://blogging.nitecruzr.net/b/post-preview?token=zx9iKDYBAAA.ySUB0XKSvMXVATQkgsbJpQ.r_B4NGbmR453Nsa2tYZPKg&postId=1855542079708688719&type=POSTSee anything interesting?
Presumably, the tokens attached to the URL make the visibility of the post temporary - and the previewed post becomes secure by obscurity. That is, if anybody cares enough to view this.Why did I see evidence that 5 people had already read the Preview (and now, said evidence is gone)?
But like every Blogger feature, there are always ways to complicate the issue.
Similar to people who, years ago, published web sites, with the web site access logs published as part of the web site (and became the original target of referer spam attacks), we have Blogger blog owners who publish a real time access log on their blogs.
A popular blog accessory, Feedjit, provides a real time list of blog pages, as read by various people. Similar to a visitor log, but displayed in real time, and to the public in general, Feedjit shows everybody what blog content is being viewed.
And here is the complication, of the Preview content. Some blog owners are concerned that the public can view their Previwed content, because Feedjit displays the URLs of the Preview displays, as they (the blog owner) develop a new post.
Please examine the URL quoted below - does any component of that URL contain any tag, suggesting to you that the content is treated as private? It's simply obscure, because (without the involvement of Feedjit, or a similar access display log), the Preview post is not visible. To check it, here's the latest Preview URL for this post.
Personally, I don't use Preview mode that much. I like to Publish my posts over a period of days - if not longer. None of my posts are actually static, I call this Progressive Publishing. You're welcome to view any of my posts, any time you feel the urge.
Watch this post, and see what changes. To start, I'll now observe that, with the post Published, all of the Preview links (above) all appear to load the finished post - until the token (in the URL) expires. If you just clicked on any of the above Preview links, you are probably now seeing
Invalid security token: Error 403since the Previews, for this post, have long expired.
The conclusion would be that Preview content is only visible until the post is Published. Until the post is Published, the Preview is available to everybody - if you choose to publicise the URL of the Preview.