Yesterday, BoomTown opined that Microsoft was nearing a decision on who would become the head of its digital efforts.

And, according to several sources and some puzzling by me–if an agreement can be reached–I think that Microsoft (MSFT) CEO Steve Ballmer’s top choice is former Yahoo tech star Qi Lu.

While this is by no means a done deal, Lu is just the kind of top tech exec that Ballmer and Microsoft would warm to over a more media-centric choice like former Yahoo COO Dan Rosensweig or former AOL head Jon Miller.

Lu was EVP of engineering for the Search and Advertising Technology Group at Yahoo (YHOO), where he ran all development initiatives for its search and monetization platforms. He was at Yahoo for a decade.

If Ballmer manages to pull off the hire of Lu–on the heels of already grabbing another top Yahoo search exec, Sean Suchter, which I reported on yesterday–the aggressive exec could almost be bypassing a Yahoo search partnership he has long sought by sucking the talent right out of the place instead.

Ballmer is like Edward in “Twilight,” attracting top-notch search execs to Microsoft’s Redmond HQ, as if they were geek versions of Bella.

Lu would be a different choice for the post than many had expected, with a much more technical background than one in online media or advertising sales.

But since all of Microsoft’s future rests on winning in the search and search advertising space and trying to catch up with its archrival Google (GOOG) from way back in the race, Lu is also well suited for the position.

If Lu takes the job, he will be the boss of three strong digital execs at Microsoft: Satya Nadella, the SVP who heads engineering for Microsoft’s search, portal and advertising platform group; Yusuf Mehdi, whose online services portfolio includes marketing, online audience business development and product management for MSN and the search properties; and Brian McAndrews, the SVP for the advertiser and publisher solutions group.

Lu is known as as solid manager, but he is also called a very nice man and unusually humble for a tech star by many, which could be a good influence on Microsoft.

Before Yahoo, Lu was on the staff of the IBM Almaden Research Center, and worked at both Carnegie Mellon University and Fudan University in China (he also got degrees from both places).

And, in the kind of cred Microsoft likes, Lu holds 20 U.S. patents.

He left Yahoo after becoming dissatisfied with all the turmoil there, quitting in June, without another job lined up.

Since he left Yahoo, there have been rumors that he might be headed to Microsoft, but not in such a prominent job.

There has also been speculation that Lu would take a position at Facebook or even return to China for a tech job.

The well-respected Lu certainly has a multitude of choices, but the chance to lead money-laden Microsoft’s digital efforts–as it suits up for battle with Google–is compelling.

BoomTown has been poking around to try to figure out who Ballmer would choose for the digital head, ever since the man who used to be in charge, Kevin Johnson, quit in July, after the software giant’s takeover bid to buy Yahoo failed.

Several people close to the situation say Microsoft’s Ballmer has been keeping the deliberations close to the vest–perhaps because so many of those he has targeted have declined to consider the job.

But this week, many sources both inside and outside the company have told me that Ballmer is close to announcing his choice.

Annoyingly, one source has decided to play a digital version of “The Da Vinci Code” with me, dribbling out clues–more technical than media, very well liked in Silicon Valley, humble–about the candidate, which he wanted me to solve as if I were Robert Langdon and on the hunt for the progeny of Jesus.

Well, my solution is in: Microsoft’s most promising digital Holy Grail is Lu.

On a related note, bizarrely, the day after this column broke the story about Lu’s leaving Yahoo, I caught him by accident in the background of a video I was doing at a Harvard Business School event honoring Facebook’s Mark Zuckerberg.

You can see him at 4:14 minutes in the video, laughing at me, as I bother Greylock Partners VC David Sze and make a bad pun related to former Yahoo exec Jeff Weiner’s departure from Yahoo.

Here’s that video:

Please see this disclosure related to me and Google.

Oh the sweet irony of Facebook Founder and CEO Mark Zuckerberg getting awarded a big round glass object, suitable for mantel-showing-off, from Harvard types.

Especially since he is now the school’s second most famous tech mogul dropout–after Microsoft’s Bill Gates.

But that was the case last night at the San Francisco Airport Hyatt Regency, where the 24-year-old Zuckerberg collected the 30th Entrepreneurial Company of the Year Award from the Harvard Business School Association of Northern California.

As is required at dinners like this, Zuckerberg had to sing for his supper in a post-meal interview about the hot social-networking site’s past and future.

At first, he did clarify that he was technically “on leave” from Harvard, as Gates also is, which the crowd loved.

(But, memo to Harvard Yard: Neither Gates nor Zuckerberg is coming back, so don’t leave the lights on.)

Zuckerberg (pictured here with me) also used the term “share information” in the interview, perhaps even more than he did onstage when I interviewed him at the D: All Things Digital conference last month.

And so much so that it could be the basis for a raucous drinking game where you take a shot every time he says “share information,” which would make you dangerously inebriated within 56 seconds.

Zuckerberg also strongly reiterated his statement that Facebook was not for sale, which is especially important now that it looks like a tastier treat to Microsoft (MSFT), in the wake of its failed takeover of Yahoo (YHOO).

But Zuckerberg specifically nixed a sale to Microsoft, which invested $240 million in Facebook and gave it its infamous $15 billion valuation.

He was joined onstage by Facebook COO Sheryl Sandberg–who is an academically scary double whammy, holding a master’s degree in business administration with highest distinction from the Harvard Business School and a bachelor’s degree summa cum laude in economics from Harvard University.

Plus Sandberg has a really effective hairy eyeball that she used to stop me from stalking her or Zuckerberg with my Flip camera.

Still, BoomTown managed to get some video of those attending the event, which was heavy with tech types.

My various quarry dispensed business advice, all while I mocked Harvard (lovingly, so don’t gripe that I am envious–am not).

So, here’s my video of last night’s event, which includes: Piczo CEO Jeremy Verba (HBS); Facebook’s Ben Ling (not Harvard) and Elliot Schrage (Harvard undergrad, masters, law!); Greylock Partners’ James Slavet (HBS) and David Sze (horrors–Yale!); Accel Partners’ Jim Breyer (HBS); and the glass award itself (totally HBS!).

And, once again, here’s Zuckerberg and Sandberg in action, somehow withstanding my withering questions at D6:

Part One

Part Two

While it is not yet clear exactly what kind of business case study Facebook will turn out to be in the end–a raging success or a raging something else entirely–that has not stopped Harvard from feting the hot and hyped social-networking site.

That would be the Harvard Business School Association of Northern California, which will bestow upon Facebook its 30th Entrepreneurial Company of the Year Award on June 17 at the Hyatt Regency San Francisco Airport.

Apparently, the glamour never stops for CEO and Founder Mark Zuckerberg, who will be at the event, leading the crowd “through Facebook’s remarkable journey.”

Well, that’s all BoomTown needed to hear, immediately ponying up the $225 for a seat for non-members (although we briefly contemplated the $10,000 “Centennial” table for six, which includes a private reception and preferred seating).

While neither Zuckerberg nor I have the fancy degrees–he dropped out of Harvard as an undergrad and I did not have a prayer of getting in in the first place–Facebook’s leadership is chock full of Harvard graduates.

(Much to the chagrin, I might add, of some of Facebook’s less collegiately endowed types, who sometimes grumble to me about the tony school’s influence there, much in the same way some at Google complain about MIT and Stanford.)

In any case, COO Sheryl Sandberg must have scored 800s on her SATs (BoomTown: a decent 720 in English and a less-impressive 640 in math, as near as I can remember)!

According to Facebook’s Web site, she “holds a master’s degree in business administration with highest distinction from the Harvard Business School and a bachelor’s degree summa cum laude in economics from Harvard University.”

Meanwhile, new PR honcho Elliot Schrage “has been a contributor to the Harvard Business Review…holds a bachelors degree from Harvard College, a master’s degree in public policy from the Kennedy School of Government and a J.D. from Harvard Law School.”

And let’s not leave out CFO Gideon Yu, who “holds a master’s degree in business administration from Harvard Business School,” while VP of Product Management Matt Cohler’s “writings on the start-up economy have been published in Harvard Business Review.”

Here’s hoping some of this Harvard brain power rubs off on me over dinner!

And, using any excuse to post two video highlight reels from our recent sixth D: All Things Digital conference, here’s Zuckerberg and Sandberg in action, somehow withstanding my withering questions last week:

Part One

Part Two