Allow me to explain what is really going on. While I do, ask yourself this: how many mobile ads have you even read, let alone clicked through to purchases on your phone? Zero, yes, I know. When I ask you this 3 years from now, the answer will still be zero. As an advertiser, what would that be worth? Yes, also zero.
In late 1999, I was part of a pre-IPO team that evaluated the roadshow presentation to be given by my client's CEO, COO and CFO. I was a consultant, not the underwriter. The IPO issuer was an IT consulting firm, nothing more, and not a very good one at that. No competition for Accenture and their ilk. At the time, anything related to the internet was trading at a 100xstupid multiple of reality, and in that very small space of time, the term of art B2B had come along and was particularly all the rage, much like the term "mobile" is at present.
Their underwriter advised them to accentuate their "B2B" business dealings in their pre-IPO docs and presentations. Needless to say, most of their revenue was "B2B," since individuals don't hire IT consultants to install and manipulate software much. Before the roadshow, their expected offering range was $15-$18. A month later, after their roadshow with all of this B2B #$%$ stoked up, they priced at $32, went out the next day at $36, traded nearly to $80, and never even sniffed those prices ever again. My client used its IPO proceeds to buy what? A portfolio of bonds, of course!! A/k/a "general corporate purposes" in stock offering speak. And they managed those bonds along with the rest of their dwindling funds right into bankruptcy.
LNKD is doing nothing more than blowing their moneyless horn about "mobile" same way Facebook has done, same way my client hyped its "B2B." I'm sure their facts and stats are true, and their mobile traffic is way up since 2011. Isn't that just common sense? How many more people have smart phones? Good luck putting your money behind that!