Here’s a good way to get your hands on scarce venture capital money: Create a start-up geared around Twitter-like “real-time” sharing and conversations. 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 it has just raised around $1 million.

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Facebook offered to buy TipJoy, then changed its mind. Now the micropayment start-up has closed, and a co-founder is working for…Facebook.

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Are you up in arms about the impending demise of tr.im, one of the many services that shorten long Web addresses? Here’s a possible solution, offered by bit.ly, the industry’s bigfoot: A nonprofit archive/graveyard for tr.im’s tiny addresses, along with anyone else who wants to participate.

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Does the world need another gadget site? Yes, say two of the gadget world’s biggest stars, who are launching gdgt.com today. The site is the work of Peter Rojas, who helped build Gizmodo and Engadget, and Ryan Block, who took the torch from Rojas after he moved on. Gizmodo and Engadget are the best known and most powerful of the new generation of gadget sites, which makes Rojas and Block revered by the gadget gang and able to cobble together funding. But they’re still taking on a very crowded field.

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Twitter notched yet another milestone yesterday when it finally showed up on comScore’s index of Web search milestones. The catch: It barely registered, pulling down a search share of just 0.001 percent. But I’m sure that comScore is missing the majority of Twitter’s searches. So what’s the real number?

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Nope, Twitter still hasn’t trotted out a business model yet, and that may or may not be a problem for potential acquirers like Google or Microsoft. But it’s a nonissue for a growing number of start-ups hoping to succeed simply by positioning themselves in Twitter’s general vicinity. Today’s example: StockTwits, a day-trader-meets-Twitter site that just raised $800,000 from venture capital firm True Ventures.

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What’s the value of a service that takes a long Web address and makes it shorter–but doesn’t have a business model? Several million dollars, according to investors who have just sunk $2 million into bit.ly, a start-up incubated by the Betaworks gang.

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Yes, you can still get someone to invest in a Web start-up with zero revenue. It helps if you can insert the word “Twitter” into your pitch, though. Meet TweetDeck, a one-man outfit that makes free software that organizes your Twitter stream.

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Twitter’s executives and investors tend to roll their eyes when people ask them when they’re going to start, you know, generating revenue. Maybe that’s because there’s a really obvious answer: Start collecting money from the many companies that are using Twitter’s infrastructure and service to create their own businesses. Newest example: StockTwits, a Twitter-based bulletin board/chat room for individual investors

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