I think there's a core of people convinced that advertising really works well or convinced that "it would if only". I'm skeptical.
For user-generated broadcast content (HuffPo), he's got a point though.
You haven't specified how they differ. What property of one is unlike the other?
Content on Facebook is more likely to be conversations between friends or information about a person (their employer, music tastes etc). This information is likely to only be of immediate interest to the individual who posted it, and to their friends.
So copying information from an article/blog post and passing it off as your own is like a newspaper ripping off another newspaper and doing no reporting of their own (or buying content for Reuters ;-) ). Repeating content from Facebook is like repeating something you overheard in a casual conversation between friends (unlikely to be of interest unless you know the people in question).
Not sure what analogy would apply to Twitter.
Facebook and Twitter provide a service for no money but you end up paying them in content which they trade to advertisers (who then give them money). Making social networking nothing more than a traditional transaction with a middleman.
The Huffington Post doesn't pay its authors or provide a service but they do offer a chance at fame through a famous distribution model. Making it a lot like gambling where most people pay more than the experience is worth (by generating content and never getting famous) while a lucky few extract a huge portion of the value (by becoming famous). But The HP is just like the Casino extracting a piece of the action through advertising.
What Business Insider does is just kind of slimy. But it mostly quotes famous people who don't seem to care if Blodget takes money from them.
So we're talking about three very different phenomenons
Some people will say that quant trading adds some value, but that the amounts the traders reap is too much.
I believe the value quant trading provides to its customers in proportion to the value it extracts is on par with social networking. A lot of the people who make arguments that quant trading provides no value have no idea how to value the liquidity that quant traders provide in the same way they can value what social networking provides. To appreciate what (most) quant trading firms provide, you have to have transacted frequently and significantly in the market.