It would be remiss of us not to publish each week a tally of the big funding deals in the social media sector. Yesterday in particular was a busy day, highlighted by Angry Birds developers Rovio Mobile scoring a $42 million. We are seeing also a lot of interest in socially-targeted ad serving technologies with two big investments in that area this week. Here’s the full rundown:

Google has unveiled overnight a series of upgrades to its now two-year-old project to make its search results more personal social. Starting today, you’ll see item like your colleague’s Tweets and your friend’s Facebook “like” recommendations interspersed in the search results.

After reading in today’s Wall Street Journal that private investors are valuing gaming developer Zynga at between $8 billion and $10 billion, and then this beaut in the New York Times – that JP Morgan is looking to raise up to $750 million for a social media investment fund – I figured it’s now time to get out a scrap of paper and compare the present, pre-IPO multiples as we know them for the next batch of Nasdaq darlings. The numbers remind me of another heady period a dozen years ago.

Good news, Dodgeball Google Latitude fans. After a quiet stretch when we thought Google might just give up on Latitude, the longest running of all geo-location check-in services (if you count its past as Dodgeball), the search king has announced it’s not dead, but instead will be recast as a mobile app that works with Google Maps.

We’re a bit surprised today to learn (a few days late) about the demise of Viewzi, a nifty tool to visualize search that was launched in 2008 by Austin-based entrepreneur Brandon Cotter and died just after Christmas.

Nearly two months after its debut, Twitter’s “Promoted Account” marketing scheme has provided companies with newer ways of upping their follower numbers. But is investing in a place on the “Suggestions for you” listing worth it? We look at three brands who’ve taken the early plunge. If time has taught us anything about this new program it’s that money can’t buy you followers.

Facebook is the first to say its new communications platform, Facebook Messages, is not email, nor is it some kind of “email killer.” Maybe not. Still, the web’s biggest email providers, Google, Yahoo, Microsoft and AOL, should be quaking today.

In today’s “you win some/lose some” category we have, yep, Facebook. We reported earlier about Facebook’s troubles in Japan as it is Twitter who is challenging the local incumbent there for top spot among social networks. But fear not. In the all important metric of “making money,” Facebook is doing just fine, padding its lead as America’s largest online display ad publisher.

It’s hardly a surprise that Google-powered Android smart phones is gaining on rivals, becoming the tech business story of the year. New numbers out of the U.S. show Android phones could actually overtake Apple’s iPhone with a strong Christmas.

Facebook has soared past Yahoo as the Number 2 place to watch online videos. More great news for the dominant social network? Well, maybe not: people still spend more time watching videos on Yahoo, and there are nagging doubts about how Facebook can actually make money from video content.