Have you ever wished that your dog could tweet for his or herself? Or that your car could let all your friends know how less gas you’re using than they are? What about a scale that does your exercise blogging for you or a tree that tells you how it’s feeling? Believe it or not, technology exists to make all these things happen. Some Tweeting and Facebooking devices are made for pure novelty value, but some use Social Media and the new culture of sharing to deepen users’ experience with the devices. It doesn’t hurt that machines that Tweet act as great publicity for themselves, either.

Starting with the superfluous, there’s Puppy Tweets, launched in June by Mattel. The package consists of a wifi-enabled motion sensor that clips onto your dog’s collar and a USB receiver that connects to your computer. After clipping the sensor on and setting up your pup’s Twitter account, the Puppy Tweets sensor determines how active your dog is being and based on the level of activity, sends a variety of pre-set tweets to Twitter. The set sells for $30 and while it doesn’t seem to be selling like gangbusters, a quick Twitter search does find more than a handful of people using it (check out LukatictheDog to see some Puppy Tweets). While Puppy Tweets is a neat idea that taps into people’s fascination with the thought of what their pets do all day while they’re at work, I’d be much more interested in a device with a camera that could really let me see what my dog is seeing all day.

Ericsson take the idea even further with their experimental Connected Tree. Updating the concept of a mythological “talking tree”, the orange tree introduced in Barcelona (which tweets @ConnectedTree) responds via tweet to the people around it and even has its own hashtag. Furthering the experience, the Tree can text those who touch it physically.

On a more useful day to day basis, scale maker Withings and car company Chevy have integrated social media into two of their devices. Withings BodyScale is billed as the first WiFi connected scale. In addition to connecting to an app on your phone (allowing easy access to graphs or your weight, BMI and fat mass), the scale can connect its data to a number of online fitness coaching websites (including RunKeeper and The Daily Burn), taking some of the effort out of managing your online fitness and, theoretically, giving you more time to work on that fitness.

Chevrolet, last week, announced MyVolt.com as a feature with its new model of environmentally friendly cars, the Volt. In addition to letting you schedule your car’s charging times (hitting the grid during off-peak hours), the Volt can also send updates to your Twitter or Facebook that inform your friends all about “distance driven, fuel economy, amount of electricity used, and other geeky statistics.”

While some Tweeting Machines are intended for novelty purposes only, integration like that in the BodyScale and MyVolt is just the beginning. My Facebook feed is full of my friends having their runs or bike rides posted via services like Nike+, Sportstracklive or Endmoto. And in a weird way, it spurs me to push that extra mile at the gym when I can see what they’re doing and have the option to share what I’m doing with others (guess it’s my competitive nature). I can definitely see a day when we’re comparing gas mileages by car Tweets or getting our shopping lists directly from our fridge’s Facebook updates. Just don’t believe my fridge when it tells you I ate a whole pint of Ben and Jerry’s Pistachio Pistachio in one sitting. It’s a bald faced liar.