Social Network Under Payment

Should we condsider the SaSas a pay-service in a nearby future? 

Dan Wineman has a short article in his blog, in which he remarks that:
Twitter and Facebook have happily provided #1, subject to various restrictions, rate limits, and arbitrary shutoffs. Any photo sharing site, blogging engine, or even RSS feed provides the second.
and suggest a way to look further in the social web.
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