Diaspora: Although in its Alpha this platform lets you share whatever you want with whomever you want and you can even host your own server!
From their site:
Diaspora makes sharing clean and easy – and this goes for privacy too. Inherently private, Diaspora doesn’t make you wade through pages of settings and options just to keep your profile secure.
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These resources are taken from Deltina Hay’s critically acclaimed book, The Social Media Survival Guide, already in its second edition. Social Media Power readers can get a discounted copy of the book from the publisher. Learn more about Deltina and her availability for speaking engagements at Deltina.com. You may also enjoy listening to her video tutorial series on YouTube.
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Author: Deltina Hay
Social Media Power founder, Deltina Hay, is the author of The Bootstrapper’s Guide to the Mobile Web and The Social Media Survival Guide. Deltina developed the graduate, Social Media Certificate program for Drury University, and offers quality online courses at DeltinaU.com.