Google New - which aggregates, clusters and ranks news articles from many sources - recently started including links to the Google+ profiles of journalists.
Here we see an example of a link to Shayndi Raice who, with Randall Smith, wrote this article on the Facebook IPO published by the Wall Street Journal.
However, the recall of the links is very low and, in fact, this link to Shayndi Raice is the only one currently visible on the Google News front page.
There are a number of sites which track and accumulate social identities for journalists. MuckRack, for example, has around 160 twitter identities for Reuters journalists - including Felsix Salmon who has around 50k followers - and many more profiles for the Wall Street Journal.
Over on the d8taplex news page, I've included twitter identities for Reuters contributors. I started out by simply using the twitter identities made available from the Reuters pages of the journalists. However, curiosity got the better of me and I ended up mining twitter for journalists. This has so far yielded over 500 Reuters journalists' twitter profiles (not all of which are currently available on the site, note).
In looking at these accounts, a large number are not active at all on twitter, while others, like Sam Youngman, provide commentary and even photos associated with the area of news that they cover.