Twitter Grader explains how they calculate twitter rankings.

First of all, nobody seems to appreciate how goddamn hard it is to make an operating system. You don’t just wake up one day and fall out of bed and make one. Not even the smarty pants kiddies at Google can do that. These things take years. Decades, even. Ours started out 20 years ago, at NeXT.

Tweet Reel lets you shoot pictures and video on your iPhone, upload them to TweetReel.com, and share them on Twitter!

Web development, Social development related plugins and handy plugins for better browsing.

iPhone Dev Team’s redsn0w is now capable of jailbreaking iPhone 3GS.

Last night we released updated versions of our redsn0w jailbreak and ultrasn0w carrier unlock. These versions are now compatible with the iPhone 3GS running at 3.0. Welcome aboard, 3GS owners! (The tools of course remain compatible with all of the other platforms too.) Also last night, saurik released 3GS-compatible versions of MobileSubstrate and WinterBoard, components that enable many different add-ons and themes.

Feedburner cofounder and CEO Dick Costolo to leave Google within the week.

Costolo has no plans for his next job/startup. But something tells me that in a few months we’ll be hearing about his next venture. He turned $8 million in venture capital into a $100 million payday. More than a few venture capitalists will be taking him to lunch at their first opportunity.

Social & viral marketing scientist, Dan Zarrella, analyzes retweeting, and provides and provides the characteristics that make them viral.

ReTweets are the first entirely observable and analyzable viral content spreading mechanism in the history of mankind and as such they offer an unparalleled window into what makes humans spread ideas.

Screenjelly records your screen activity with your voice so you can spread it as a video via Twitter or email.

Use it to quickly share cool apps or software tips, report a bug, or just show stuff you like.

Looks like YouTube has been a cash guzzler for Google(purchased for $1.76bn), and losing hundreds of millions of dollars a year.

If you have a Mac with Growl running on it, then now you can use Prowl iPhone app to push growl notifications from the Mac to the iPhone.

Pablo Matteoda’s Sharky Tea Infuser, an entry from Design Boom’s competition to find design solutions for functional and prestigious silverware with a new twist.