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Twitterfon, by a mile. Not only is it free, it has practically every key feature that Tweetie and other paid apps have.
 
The only real advantage I see for Tweetie over TwitterFon is the ability to have multiple accounts. This is good for someone like a developer who has a personal account and a company/app account as well. Otherwise, TwitterFon is the way to go.
 
Twitterfon

I have both Tweetie and Twitterfon on my iPhone and always find myself going back to Twitterfon.

Tweetie may have some nicer interface touches, like the Twitpic viewer, but it's Twitterfons auto loading of all the messages, replies and DM's which wins it for me
 
Personally i love Tweetie, it costs a little, but its UI design and usage are considerably better than any other twitter app out there.
Not forgetting the popularity enhancer mode, which just wipes the table with all the other twitter apps ;)
 
I use Tweetie, but tried TwitterFon recently. It's pretty darned good; especially for being free. :)
 
I have Tweetie and Twitterfon, used to have Twinkle. Out of all of them I like Tweetie the best. Nice UI and update regularly.

I really didn't like the separate Twinkle service, I prefer twitter on private and Twinkle didn't respect that at all, I had random people responding to my tweets!
 
I got a promo code for SimplyTweet here and it's the twitter app I've been using. I'm only a basic twitter user and it fills my needs. Great app!
 
I've tried Tweetie, TwitterFon, Twitterific (free), and Twinkle. The one I always come back to? Twinkle. Hands down!
 
im gonna trust u guys and try out twinkle. this will be my first time using twitter
 
I was using twitterfon i think is the best overall and free! I have decided to try some others. So far I bought twitterville and twitterena. Twitterena has a really nice theme and is fun to use. I did notice that the developer gives credit to the author of twitterfon, which makes me think its not much more then a re-skinned app, which is sort of weak but it was only .99 So as much as people like twitterfon this has all the same features but with a improved interface and chrips for new tweets(i love that).

The other is twitterville, that app seem to be getting a lot of updates and attention. It has the same look as twitter would on your pc. it doesnt have all the features the others have but theres an update coming and the developer is working hard to make it much better.
 
im gonna trust u guys and try out twinkle. this will be my first time using twitter

I'd recommend Tweetie. I've been a little disappointed in Twinkle and development in a lot of ways seemed to have stopped. If you're looking for a free client, I'd suggest Twitterrific.

I like Twitterrific 2.0 but I just can't let go of Tweetie. They have some features that I consider important and I naturally keep going back to it.
 
I have Tweetie, Twitterific Premium and Twittelator (plus Birdcage, for composing Tweets I later want to post). Each of them have their own good points, of course, but I would say definitely go with Tweetie:

It's got a very elegant UI, including all the features like Timeline, it's cheapish at U$2.99, and like Twinkle -- which I haven't tried -- it has the "Nearby" functionality. If you're going to do something, at least give yourself a chance to like it by getting a decent app.

As for whether you should even be on Twitter, that's really your call.

I personally was there when IRC and chatrooms started; I was there when Facebook took off, and when Linkedin made waves, so there was no way I would miss out on Twitter. Instead of making friends, like on Facebook, on Twitter one can actually have a link to and speak to the power brokers of this world, real-time (I'm not kidding. A friend of mine now regularly Tweets with Karl Rove, of all people).

If you just want a time-wasting device, to chat with random people, not all of them worth your time, check out the Distant Shore app. It'll be right up your alley.

But Twitter is just new enough so that it hasn't been ruined, like at times I feel Facebook and certainly Friendster/MySpace have been. Everyone should be on it, if only for the interconnectivity.
 
I have Tweetie, Twitterific Premium and Twittelator (plus Birdcage, for composing Tweets I later want to post). Each of them have their own good points, of course, but I would say definitely go with Tweetie:

It's got a very elegant UI, including all the features like Timeline, it's cheapish at U$2.99, and like Twinkle -- which I haven't tried -- it has the "Nearby" functionality. If you're going to do something, at least give yourself a chance to like it by getting a decent app.

As for whether you should even be on Twitter, that's really your call.

I personally was there when IRC and chatrooms started; I was there when Facebook took off, and when Linkedin made waves, so there was no way I would miss out on Twitter. Instead of making friends, like on Facebook, on Twitter one can actually have a link to and speak to the power brokers of this world, real-time (I'm not kidding. A friend of mine now regularly Tweets with Karl Rove, of all people).

If you just want a time-wasting device, to chat with random people, not all of them worth your time, check out the Distant Shore app. It'll be right up your alley.

But Twitter is just new enough so that it hasn't been ruined, like at times I feel Facebook and certainly Friendster/MySpace have been. Everyone should be on it, if only for the interconnectivity.

I completely agree.

A lot of people say that twitter is just like facebook status. Well, at least for me my friends facebook status are just apps and games notifications, I have to comb through all that stuff to actually find something worth reading.

On twitter I'm actually following people that, even though I may not know them personally, have very interesting things to say. And from what I've seen, I don't think twitter could get ruined like Myspace and Facebook, at least not easily.
 
And from what I've seen, I don't think twitter could get ruined like Myspace and Facebook, at least not easily.

Agreed.

It's because it's more adult. Sort of like Linkedin, but with the instantaneous feedback of Facebook. For me, it's telegraphing by another name.
 
I am using Tweetie and it is the best one I have used because of how easy it is to use and nearby.

If you are looking to get a free twitter app, get Twinkle... it also has nearby.
 
I started out using Tweetie and downloaded Twitteriffic just to try. Tweetie won out of those two and then I tried Twitterfon. I haven't looked back since. It's the cleanest and easiest to use, IMO.

I recently saw a review/screenshots of Twitterville and may be giving that a shot. I like the iChat-like interface.
 
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