Micro-blogging company Twitter.com is rumored to be closing a deal worth $100 million in venture funding. The rumor is according to a Wall Street Journal source. The investors involved are T. Rowe Price, Insight Venture Partners, Spark Capital, and Institutional Venture Partners (IVP). This is double the rumor that a TechCrunch source predicted earlier this month.

Spark Capital and IVP are previous investors in Twitter. In Twitter’s last round of funding, their valuation was $255 million. At an additional $100 million round of funding, the company is expected to be valuated beyond $1 billion. Despite the valuation Twitter has, the company does not have any substantial revenue model. But as we have learned from YouTube’s acquisition, that really doesn’t matter. YouTube was burning through VC funding before Google bought them out.

How many users does Twitter have? The company expects to have 25 million users by the end of this year. Twitter rival Facebook.com has about 300 million users. At one point Facebook made an offer to buy out Twitter for $500 million, $100 million in cash and $400 million in stock options. Rather than buying out Twitter, Facebook bought out FriendFeed.

As you give a goofy look at the camera pointing at you in a photo kiosk at an entertainment venue, you begin to wonder what captions and background you’ll use.  Now take this concept, slap it on the Internet in the form of a widget that can be Facebooked or MySpaced, and you’re ready to raise $50 million.

Business-savvy Internet entrepreneur and PayPal co-founder, Max Levchin did exactly that, as mentioned in BusinessWeek.  Slide raised $50 million and increased their valuation to $500 million.  This fourth round of investment was provided by Fidelity Investments and T. Rowe Price.

Photo widget companies is a proven model for acquisition targets, but is also a proven model for its vulnerability of mooching on other social networks’ user base.  For example, Photobucket was acquired by News Corp. in May 2007 at a price of $250 million in cash.  But before the acquisition, MySpace completely blocked Photobucket from accessing their users because of an advertising violation before making a truce. 

Altogether, Slide has raised over $75 million including investments from other PayPal co-founder, Peter Thiel and venture capitalist, Vinod Khosla.  Thiel is an early investor of Facebook.  The other founders of Slide include Jared Kopf and Scott Banister, both also former PayPal employees.

Previous Slide coverage is available at: http://pulse2.com/category/slide/.

Amazon.com announced today that they are investing in Bill Me Later, Inc. Not only that, but Amazon is also signing a agreement with the online billing company as well. eBay and PayPal has thus far proved the synergy of combining an online retailer with an online billing payment company. Over 90% of all eBay auctions are paid via PayPal so it made sense for eBay to buy them for $1.5 billion.

“Bill Me Later has developed a very customer-centric method to make online shopping even easier,” stated Matt Swann, VP of payments at Amazon.com. “We are pleased to make the convenience of Bill Me Later available to our tens of millions of Amazon customers [source: Amazon.com press release].”

The investment terms were not disclosed, but the company has $200 million in funding capital according to TechCrunch. Bill Me Later investors include Chase Paymentech, Azure Capital Partners, First Data Corp, Crosspoint Venture Partners, GRP Partners, CIT Group Inc., Citigroup Corporate and Investment Banking, Citigroup, Equifax, T. Rowe Price, and Legg Mason Inc.

“Amazon.com and Bill Me Later share the same commitment to making shopping easy for consumers,” stated Gary Marino, the CEO of Bill Me Later. “Just as Amazon invented a new and better way for people to shop online, Bill Me Later has created a new and better way for people to pay for purchases online.”

Before joining Bill Me Later, Marino was an EVP, Chief Credit Officer, and Chief Marketing Officer of consumer lending at First USA/Bank One.