Here’s our roundup of the week’s tech business news. First, the most popular stories that VentureBeat published in the last seven days:

fridayRebecca Black’s awful “Friday” song could be unstoppable on YouTube — 30M views and counting — Rebecca Black’s “Friday” single has been uniformly panned as the worst song ever on the internet. And that has helped turn the 13-year-old girl’s song into an instant hit.

Firefox 4 blows away Internet Explorer 9 with first day downloads — As if you needed a reminder that the next browser wars have begun, Mozilla’s Firefox 4 browser managed to double Internet Explorer 9’s first day downloads in less than 24 hours.

Sprint smack talk luring away bitter T-Mobile customers? — Whether intentional or not, Sprint CEO Dan Hesse may have started bringing bitter T-Mobile subscribers to the Sprint network.

Y Combinator’s best startups ever? Here are my favorites — Was the most recent class of startups incubated by Y Combinator the best group ever? That’s what entrepreneur (and current YC designer-in-residence) Garry Tan told me.

Airport seating charges your phone with PowerKiss — The company just announced a partnership with airport seating supplier Zoeftig that should result in mobile users being able to charge their phones while they wait to board a plane or train.

And here are five more stories we think are important, thought-provoking, fun, or all of the above:

color multi lensWith massive funding, Color aims to reinvent mobile photos — After the South by Southwest Interactive conference last week, you’d think the world would have its fill of mobile social networking apps. But here comes another big launch, this time of a free iPhone and Android app called Color.

Is Motorola gearing up to abandon Android for its own OS? — It may sound crazy, but there’s reason to believe that Motorola isn’t content to rely entirely on Android for its mobile future.

The pop culture alliance of Lady Gaga, Google, Twitter — and Rebecca Black — Pop singer Lady Gaga visited both Google and Twitter this week, and VentureBeat’s Dean Takahashi has been wondering what that means for how celebrities are feeding off of Silicon Valley and vice versa.

Rob Solomon: Too rich for Groupon? — The No. 2 executive at daily-deals purveyor Groupon, Rob Solomon, has taken advantage of the company’s unlimited-paid-days-off policy — for good.

Can tablets replace laptops and desktops in enterprise? — Tablet computers will one day completely replace laptops as the standard-issue workplace computer — at least, if some of the top tablet and phone manufacturers in the world have their way.