That’s the core of Twitter’s pitch, of course, and it has helped the microblogging service raise $155 million, a $1 billion valuation, and forge partnerships with Google (GOOG) and Microsoft (MSFT). Not surprisingly, investors are looking to place money on related bets, from search engines that parse real-time data to location-based social networks with real-time updates, and even real-time photo-sharing sites.

The newest entrant: Hot Potato, a buzzy start-up that’s supposed to let users converse about a particular event, whether they’re attending it in person or watching from afar. When it’s up and running, that is. The five-man crew doesn’t have users or a product just yet.

But that hasn’t prevented the Brooklyn, N.Y-based company from raising about $1 million, sources say, in a round led by First Round Capital and RRE Ventures. A group of smaller investors, including Betaworks, the incubator that specializes in real-time companies, and Ron Conway, the angel investor best known for his Google bet, are also backing the company.

Hot Potato is led by Justin Shaffer, an eight-year veteran of Major League Baseball Advanced Media, pro baseball’s well-regarded Web unit. Shaffer has recruited three other MLB.com employees (one of whom subsequently left to get an MBA at MIT) to join him.

Shaffer wouldn’t comment about his funding round, but was willing to discuss his start-up’s general plans. They are finishing an iPhone app and plan to submit it to Apple (AAPL) in the next few weeks, he said, and will open their doors once that’s approved.

The big idea is an interesting one. People are already using Facebook and Twitter to converse about events in real time–think about Barack Obama’s inauguration, or Balloon Boy, or last night’s Yankees-Angels game.

Shaffer’s critique of those platforms, though is that “they break at scale–there’s no good way to filter the chatter so that  you, your friends, and a group of strangers with something relevant to say can all connect. Hot Potato, he says, will offer a “curated stream” in real time of all the data coming out of the event in real time. What we’re really focused on doing is bringing together the entire audience of an event, whether they’re at the event or watching at home.”

Business model? TBD, of course. But there are a couple of obvious ways to go. For instance, Shaffer thinks people who opt-in to a particular conversation–say, about an NFL game or a U2 concert–would be okay with seeing “in-stream” ads, as long as they were relevant.

But that’s a problem that’s best tackled once the service is up and running. We’ll check back then.

Check it out (click tables to enlarge):

Note that these numbers are actually all down from August. Apparently some of you spent your last days before returning to work or school in front of your Web browser.

Meanwhile, Nielsen’s Top 10 list has the usual suspects. That is–Google’s (GOOG) YouTube and then everyone else. Interesting to note the disparity between total audience and total streams on Hulu compared to Yahoo (YHOO) and Microsoft’s (MSFT) MSN. Hulu is attracting a smaller but much more engaged audience than the big portals.

At some point, this could be a problem for the joint venture between News Corp.’s (NWS) Fox, GE’s (GE) NBC Universal and Disney’s (DIS) ABC since advertisers ultimately want reach. But it’s still astonishingly early for the site–recall that it only went out of beta in March 2008, and doesn’t have a major portal promoting it.

One caveat: Note that for whatever reason, Web video publishers tend to push the numbers they get from comScore (SCOR) more than the Nielsen numbers. But directionally, they tend to say the same thing.

Allrighty, then. If you’re going to spend so much time watching Web clips, best to make sure you’re watching something excellent. Like this clip from last night’s “The Daily Show”–a classic evisceration of CNN. Jon Stewart and crew often go after the cable channel and its brethren, but this one is particularly good. Warning! It is more than 11 minutes long!

ComScore says that traffic to the joint venture between News Corp.’s (NWS) Fox and GE’s (GE) NBC fell 10.8 percent from October to November, dropping from 5.3 million unique visitors to 4.8 million. (Hulu’s PR team notes that ComScore’s separate “VideoMetrix” panel assigned a much bigger audience to the site last month: 24 million uniques. They haven’t put out November numbers yet but I’ll update when I get them).

ComScore (SCOR) says U.S. traffic at Google’s (GOOG) YouTube also dropped that month, but by a much smaller margin–0.006 percent. And since YouTube is a global property, those numbers are less telling. Hulu, meanwhile, is a U.S.-only site (much to the dismay of blog commenters).

Apologies for not figuring out how to show you this data in graph form–I’ll figure it out eventually. For now, click to enlarge.

This makes plenty of sense: Hulu was one of two places were you could (legally) see the “Saturday Night Live” Sarah Palin clips, which were huge sensations. The other one, NBC.com, dropped a whopping 50 percent–from 14.1 million to 7.2 million, comScore says.

And all sorts of Web sites that enjoyed a bump during the run-up to the election have tailed off a bit since then. ComScore says the Huffington Post, for instance, is down 20 percent– from five million uniques to four million. Presumably Oak Investment Partners was aware of that before it sank $25 million into the site last month.

Meanwhile, Hulu still shows impressive growth. If I could have figured out how to create a graph, you’d see that Hulu has still had a huge run-up since March, when it left beta.

Speaking of beta, video site/blog punching bag Joost has logged its first full month of traffic since its Web video player became open to the public. ComScore pegs traffic at 1.1 million uniques; the company says that its data, which include global traffic, show 2.1 million.

Those aren’t huge numbers–I can think of several text-only blogs, which cost a lot less to build and operate than Joost’s site, that garner more eyeballs than that–but they’re not terrible either. Still, Joost has a lot of ground to catch up if it wants to give Hulu a run for its money.

Last but not least! Here’s an excellent clip from the smart folks at the Onion. It’s a month old, but news to me. Enjoy: