If you want to put your content online and keep it there as an archive, it's best to have your own site or blog that you control. If you use something like Posterous, Tumblr or other free services they can shut down at any time for any reason and there is nothing you can do about.
Even here on G+, I still maintain my 9-year-old WordPress blog and use +Daniel Treadwell's excellent plug-in to pull in all my posts and comments. From there I can backup, share and control it. If you have your own site, you can still share content to other services like G+, Twitter and Facebook.
Posterous closing on April 30th to focus on Twitter
It’s almost inevitable as breathing: a tech powerhouse acquires a clever yet small startup solely for its talent or technology, and lets any leftover
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The nice thing about Posterous is that I could post via email…so I had automatic back-up in the form of my Sent folder!