The sex. But seriously. The speed. The numbers of people you can interact with efficiently. The fact that every message has a permalink (I wish I could permalink to specific comments here). - Robert Scoble

I love that it's an avenue to express what I'm thinking right now - Shey, Jamaican of FF

For me it's the truly dynamic nature of the service. The spontaneity creates an ever-flowing sea of information surrounding so many topics. It's so accessible, so easy, yet so hard to explain to others :) If I had to create a value proposition for Twitter to any executive, I'd be stumped. It's just so darn cool. - Bwana ☠

I also love getting a peek into what others are thinking - Shey, Jamaican of FF

The speed... not always. - Morton Fox

I like the speed, real-time interaction and conversational / debating dynamics that occur here! very cool. I like Scoble's idea of permalinking to a single comment; heck I still want a REPLY feature to a single comment too! - Susan Beebe

I can talk to RTM and reach people via SMS. I can see what people "smarter" than me are reading/writing/thinking - Rahsheen ™, Coach of FF from Alert Thingy

Sex, expression, speed, dynamics. We have the makings of a major motion picture here. Seriously, I echo Rahsheen. Who would have thought that a concept so simple could provide for the sharing of such rich information? Its a true glimpse into the human network. - jcunwired

Exactly!! this is why I love FriendFeed and enjoy it so much! - Susan Beebe

Just started more activel using. Got a little bored with Twitter. Miss the chatroom-like energy, but like the links to deeper (and often better) content. - Clayton Donley from Alert Thingy

For me, the greatest power of twitter is that people are listening. When someone tweets they expect a reply...whereas FF seems to be a bit more of a bookmarking utility (which i still enjoy a ton). In addition, there are few things more exciting than using twitter at an event and catching the stream-of-consciousness from all attendees. I've even enjoyed going back and reviewing post event. - Tyler Hannan

I feel like I work in the office of the people who's blogs I admire... I get to stop by thier office and even catch them in the hall between meetings. - Nancy Babyak

(1) The simplicity of Twitter lets you use it for whatever you want. (2) SMS is a fantastic interface for those who don;t "get" the web. I have relatives who ONLY use SMS to Tweet. (3) Twitter is a grea tplace to start a discussion and (4) Twitter has great people. - Soulhuntre from twhirl

1) there's a magic to twitter and all of a sudden it occurs to me that one of the reasons we're so enamoured with it may just be its fallibility. it makes it all the more human. 2) my friends on twitter are awesome. what can i say. 3) i really like the easy way to personalize the look. the change in avatars alone is entertaining. - isabella mori

I started my Twit-out this morning. Being in Malaysia, Wednesday came really early. :P 14:25 now...just a few more hours to go. Strangely tho, I feel kinda ok not Twittering today. - Paul David

Its simplicity. You can communicate in seconds. Right now I'm emailing posts to a pseudo-microblog, and hopping through many more hoops than I would if I just typed something in slandr. - Ontario Emperor

Absolutely the speed. Twitter is such a part of my distributed information workflow that when it goes down I feel seriously cut off from the world. But I'm willing to wean myself from the Twitter Teat (tweater?) for a day just to see if this makes a difference. - cecily

That you know - It is guaranteed: "Less gab in one entry!" =) - Erhan Erdogan

Twitter solves the tl;dr problem. - Morton Fox

Simplicity. The fact that your messages can be promiscuous or private. The sheer voyeuristic frisson of knowing What Someone Else is Eating for Dinner. The fact that it's a status board, a 2-way communications system, and a blog WITHOUT HAVING A MODAL SWITCH. The similarity to Speakers' Corner in Hyde Park. The fact that it sometimes fulfills our Deep Inner Need to Complain. The fact that it is both CB radio and a Message in a Bottle. - Karim

I thought I was the only one tweeting my dinner. Now it's a Twitter stereotype? Funny! - Morton Fox

Also, the light hypnotic trance achieved by contemplating the question, "What are you doing?" Zen koan or accusation? YOU decide! - Karim

The 140 character challenge... And my own unexpected answers to "What are you doing?" - Lisa L. Seifert

I really don't have much interest in social networks like Facebook - Twitter is a social network, but lightweight enough to work for me. No fending off app requests, or visiting page after page to leave quick messages for people. Simplicity. - Michael Randall from twhirl

in time of social networks, twitter is the best, the reason is the people here, intelligent users give the network it's value - Dobromir Hadzhiev

I concur with most of the comments above: brevity, simplicity, quick(when it works), gets the word out, etc. - Mathew A. Koeneker

Twitter has the potential to be the fastest news reporting services on the planet. - Vince DeGeorge

Communicating with masses in mere seconds, Twitter FTW. I love it for its sexinness, speed, and apps up the wazoo. - Jon Bishop

Another point is the size of the group you are addressing. In FriendFeed, this comment thread is basically a small conversation between us, and anyone who happens to wander in. If I were on Twitter now, I would automatically be conversing with a few hundred people at once (or, for Robert or Jason, thousands upon thousands). A whole different dynamic of conversing. - Ontario Emperor

I agree Ontario -- To me, the beauty of Twitter is it's 140 char limitation. No complex convos involving multiple parties make it easier to say what you have to say. No worries about not getting heard because folks are reading more than they are writing. - Shey, Jamaican of FF

I used to get a lot of my news information and announcements from sites like digg. But now that I have and use twitter I find that the fastest and easiest way to find and get information delivered directly to me instead of me having to dig through my rss subscriptions. Friendfeed is also a great way for me to get new, information and announcements but I still need to dig through the information. - Jeff from twhirl

I've got a little twitter fatigue right now (which is why the twit-out is so appealing) but ultimately, I love that it is my life's back channel. I don't care about how many people use it or what the twitter buzz is. I care about what the people in my life, or people I find interesting to my life, are thinking, feeling, finding important. The sense of connection and sense of community in the truest form of that word is what makes twitter special. - Jason Toney

One reason that I love Twitter is because messages can be directed to me and, if people follow the syntax (use my Twitter handle at the beginning of the tweet), I will find them. Look at Shey's comment 3 above this one; I very easily could have missed it. - Ontario Emperor