There have been many amazing inventions in the last years old. In my opinion the best invention is the Twitter.
Thanks to the Twitter you can write with the people the of your city or other countries almost instantly.
In addiction you can go up photos, videos and can do twetcam( TC ), retweet ( RT ), follow and you follow, chose the favourite tweet and Trending Topic( TT )
The Twitter is the best social network invented.Is different the others.