Twitter is just a little messaging service - you can post a 140-character message, and it appears in the Twitter account of anyone who is "following" you. You can also get the "tweets" as they are called as text messages on your phone if you so choose. It is free as well
I tweet every day to update all the "followers' on who each day's dog, cat and pet of the day are. That way they get a little reminder and say for example it is a bunny and they love bunnies, they can click over to http://PetoftheDay.com sooner!
Does that help?
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