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Joint essentially turns any Twitter hashtag into an IRC (Internet Relay Channel)-like chat room, which is integrated with a realtime hashtag stream from Twitter.

you’re trying to engage in a conversation with someone on Twitter that goes beyond a few “@ replies”, you’re either forced to DM or take the conversation elsewhere. Joint allows users to easily join a group chat, as well as discuss notable or popular hashtags. For instance, of late “#irene” has become a much-used hashtag, as Hurricane Irene is poised to hit the East Coast. Joint could become a very useful resource for people looking to easily congregate and discuss ongoing situations like hurricanes, protests, or events, live, from any location.

because tweeting with hashtags means that your tweets get archived and live forever on search engines, etc., many people feel uncomfortable about having public conversations (about more private issues, especially) on Twitter.

First Facebook, then Twitter and now Foursquare; Obama sure gets around (social platforms). As announced today on the White House blog, Obama will be checking in to the location-based service as he hits stops on his economic bus tour in the Midwest. Of course.

oursquare has launched its Tip Lists features today, attempting to capitalize on people’s unending desire to create lists about locations, like Top Five Coffee Shops in SF, etc etc. Up until now your Foursquare Tips have sort of roamed free on the app, without rhyme or reason or real incentive to add more. Today the company is trying to improve on the Tips experience and get users to fancy themselves local experts. After all, you must know something about some place in the city you live in right?

Creating a list is relatively easy, as the entry field auto-populates with places. There is also a collaborative functionality, which lets people who you’re friends with edit a list.

The Tip Lists will also feed into Foursquare’s Explore functionality, which serves up recommendations for Food, Nightlife and Coffee based on your friends’ Checkins and Tips.

If mobile video sharing is to follow in the footsteps of its more desirable mobile photo-sharing cousin, which application will users want to use to shoot, share and discover video clips? It’s too soon to tell, but startup Klip joins the fray and is now vying for your video attention. The startup released its application for iPhone on Monday with a focus on letting users share super-short 1-minute video clips — on Klip or with Facebook, Twitter and Youtube — and helping users discover clips from friends or other users based on topics of interests. “Klip re-invents the way consumers experience the world by organizing mobile videos in real time and by connecting consumers with the people and the topics that interest them,” the company says.