#1 - Twitter's micro-bloggin format allows me to get updates on friends, without all the blasted info-clutter of FB.
#2 - Twiitter allows me a peak into influencial and famous people's world in a way that is fascinating, informative and inspiring (e.g. Tony Hsieh, Zappos CEO; Stewart Cink, pro golfer, Newt Gringrich - political thinker; Chris Anderson, Curator of TED).
#3 - Twitter allows me to get great content, leads, quotes, links from those I follow, effectively acting as a culling mechanism for the best ideas, practices, trends that are emerging.
#4 - Per #3 - Those I follow effectively act as a quasi "research team" feeding me with new ideas, inspiration, encouragement, stories that put gas in my tank (e.g. Mark Driscoll / Resurgence). It multiplies my reach greatly.
#5 - Twitter helps personalize you to people, which strengthens connections and makes you more accessible & human to people. That's worth a lot when you can't meet everyone. Hence, Twitter is a time multiplier.
#6 - Twitter, as has been greatly documented, is a great marketing / awareness tool.
#7 - Twiiter allows me to get breaking world and national news.
#8 - Twitter posts are more entertaining than FB.
#9 - Twitter posts are more educational than FB.
#10 - Twitter's search function of what's being twittered in real time is amazing. Like an instant poll on any subject. Like a mini-google function for the Twitter world.
#11 - Love the RT (re-tweet function); allows you to pass on the love.
#12 - It's easy to use, easy to learn site; took me 2 months to get use to FB, and I'm techno-savvy.