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

steve-jobs-appleSteve Jobs’ cancer clinic sighting sparks new Apple worries — Apple chief executive Steve Jobs is receiving treatment from the Stanford Cancer Center, according to reports in the tabloid National Enquirer and gossip website Radar Online. These aren’t terribly reliable sources, and Jobs actually showed up at a dinner with President Obama on Thursday, but the rumors fed into the general uncertainty about Jobs’ health.

IBM’s Watson obliterates humans in first Jeopardy round — After tying for first place on Monday, IBM’s Watson supercomputer trounced its human competitors on Tuesday night in the conclusion of the first round of its Jeopardy challenge.

It’s alive: IBM’s Watson supercomputer defeats humans in final Jeopardy match — And Watson’s winning streak didn’t stop with the match mentioned above. It won the final round of the man vs. machine challenge on Wednesday.

Apple’s iPhone 5 may sport a 4-inch screen — In addition to releasing a smaller version of the iPhone, Apple is also looking to expand the screen on its full-size phone to 4 inches, according to unconfirmed reports.

Can Nexon make social games more engaging? (video) — Nexon has proven to be one of the fastest-growing online game companies of the past decade. Now the company is setting its sites on social games on Facebook and mobile games on tablets and smartphones as well.

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

zynga-mark-pincusWTF: How long before Zynga becomes the most valuable video game company? (poll) — It’s time to start taking bets on this question: Could Zynga become the most valuable company in the video game industry? With its rumored funding round of $500 million, Zynga’s value is estimated to be $10 billion.

The curious story of electric cars and Texas — When people think of Texas, there are always certain stereotypes that come up — cowboys, twangs, conservative politics, boots, guns, and big, gas-guzzling trucks. But Texas can surprise you.

Is Google’s Facebook competitor almost ready? — Some recent upgrades to Google products suggest that the company is advancing with its social plans and may be laying the groundwork for the big launch.

Y Combinator founder: There is no tech bubble — There isn’t a budding tech bubble like the one that caused a recession in the early 2000s, according to Y Combinator founder Paul Graham. That’s because companies today are better than they were a decade ago.

Nokia Plan B: Journalists fooled by “one very bored engineer” — The buzz over Nokia’s potentially risky new partnership with Microsoft continued to rise this week, culminating in a group of disgruntled, anonymous Nokia investors calling themselves Nokia Plan B. A group that turned out, ultimately, to be a hoax.