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Voting ends tonight (11:59PM CT) in the Pepsi Refresh SXSW Challenge, where Mashable is supporting SparkHelp, a location-based mobile application that looks to connect people to opportunities to volunteer in their communities.

As a quick refresher, we’re competing against two other teams to help SparkHelp win $50,000 in funding so they can pursue their idea. If you want to help us out, you can append the hashtag #RefreshMashable to your tweets until voting ends, Read More...

Seesmic demonstrated a new desktop client for Twitter, Facebook and LinkedIn today. Since it’s based on Microsoft’s cross-platform Silverlight software, it works on both Windows and Mac computers. Seesmic has also opened the software up to third-party plug-in development.

Seesmic is currenly best known for Microsoft .NET-based Seesmic for Windows, which many Twitter users consider one of the best Twitter clients for that operating system. It also offers a multi-platform client based on Adobe Air Read More...

It’s that time again — the Engadget Show returns this Saturday, March 20th at 5pm! We’ll be joined by Nicholas Negroponte, founder of the MIT Media Lab and OLPC project for what’s sure to be a rousing conversation. What’s more, we’ll have Joystiq’s Chris Grant on hand and Sony’s Senior Researcher Dr. Richard Marks will be showing off the PlayStation Move… and we’ll be letting some lucky audience members demo it live on the Read More...

We’ve written about FunMobility’s nifty picture messaging app for the iPhone and Android, called FunMail, that allows users to blasts their text into the application, which then breaks down whatever the user typed for context and places fun graphics with your original text. Now, FunMobility has caught the Twitter bug and is launching FunTweet, a web service which turns any Twitter stream into visual messages that are related to the text.

Similar to FunMail, Read More...

The Web is huge. And growing. Faster everyday. It’s almost like an ocean where there’s no evaporation (the data on the Web stays there virtually forever), but yet, it’s always raining in it. The rain is the new content that’s added into the ocean.

Every tweet is a drop, every blog post is a drop, every check-in is a drop that falls into the ocean. This ocean is almost constantly under a tropical storm in some Read More...

If you’ve ever done SXSW before, then you know about the music here in Austin. If you haven’t, let us tell you now – there’s a lot. But how do you find it all? And how do you find out which show is best? And how do you share blogs, photos, videos and tweet about it all at once?

SuperGlued, which has integrated with both Foursquare and Twitter, will be your your one-stop shop for the Read More...

Twitter has just flipped the switch on geolocation within Twitter.com. Now at least some users can pull up location-based information from individual tweets on the microblogging website.

While attaching locations to tweets has been possible for several months now through third party apps, Twitter.com itself hasn’t done much geolocation until today. It was first noticed yesterday, but the full rollout seems to be happening today.

It’s a simple integration: with any tweet that has Read More...

We’ve seen many, many iterations of the popular tower defense games over the years, but this one has a special meaning for all you Twitter fans out there.

Based on a tried and true concept, Tweet Defense is an iPhone game that lets you fight zombies with various tower defense units, but with a social twist: it grabs your various Twitter stats – number of followers, friends and tweets – and calculates bonuses to your Read More...

We just came across Packrati.us, a simple bookmarking service that allows you to essentially sync your Twitter feed with your Delicious bookmarks. Once you sign up with you Twitter and Delicious accounts, Packrati will follow your Twitter feed, and whenever one of your tweets contains URLs, the site will add them to your Delicious.com bookmarks.

You can also bookmark URLs in @replies to you. In your Delicious account, the service will include any hashtags you Read More...

Late last year, Ustream and qik launched iPhone applications that let you stream videos from the iPhone to the web and allow others to watch them as they’re being recorded. And now there is an iPhone app called TwitCasting Live (iTunes link), which offers the same basic functionality, but is – as the name suggests – much more deeply integrated into Twitter.

The free app is essentially a live streaming app and Twitter client rolled into Read More...