My second or third hand understanding is that mobile search results are notorious for resulting in extremely low uptake. IE, nobody buys anything from phones. (Because they are used exclusively by teenage girls.

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Social media user == deadbeat with no money to spend wanting a lot of sh*t for free and things to be spoon fed to them.
This jibes with the article's point.
My own objection to social media is that it transforms users into a commodity. Whenever you "like" a consumer good from Facebook you are willingly becoming a little advertising node for it.
There is a case in the courts in California now where Facebook's pushing of links to users that show them their friends who "liked" a product are actually unauthorized and uncompensated testimonials, and therefore are illegal. In other words this style of targeted marketing that Facebook applies automatically is legally being treated the same as a celebrity who is being quoted in advertising without their permission.
I say it's about time.