What an odd comment. According to your link the journalists were employed for a LinkedIn feature called LinkedIn Daily Rundown. This is seemingly a journalistic endeavor, and as with any product offering would be a strategy to keep people engaged with the site. Why not also point to LinkedIn offering direct messaging as "clearly a strategy to get people to spend more time on the site"?

I say this because your dangling comment seems to imply that LinkedIn's employment of journalists is so that they may practice their journalistic dark-arts on unsuspecting users in a ploy for them to spend more time on the site.