During my beta tests with Split Test Monkey, I found it simplifies things to make it easier to setup and fast without all the complex features.  I ran a list building campaign with cold YouTube Video SEO traffic for 16 days. I expected conversions at 4-10% or much lower because people didn’t know me. I tested two… “19.43% List Conversions and $4985 in Revenue?”
For example, if someone is on your list and they choose to unsubscribe later, they still count as an email in the system which is included in your total subscriber count. You must fully delete that record from your account in order to not have to pay for it, and so I found myself going into each of my individual lists and deleting unsubscribes from my account about once a week.

AWeber offers three email editors: a drag-and-drop WYSIWYG editor, a plain text editor, and an HTML editor for those who prefer to code their own emails. The WYSIWYG editor is pretty easy to use and allows for a fair degree of customization, though not quite as much as I would have liked. You can insert a simple “Click here” button, coupon, logo, or signature with the click of a button. Social share buttons are easy to generate once you link AWeber with your Facebook and Twitter account. Drafts are autosaved every two minutes, and you can see a list of previous versions (so that if you accidentally delete something, you can usually retrieve it).
Email #2, sent to subscribers a day later, pitched my eBook study guide. I had explained that it was everything they needed to know to pass the LEED exam, conveniently packaged into a printable PDF file and delivered immediately upon purchase. The link in the email sent people over to my sales page, which had a lot more information on the features and benefits of the product.
We hope that you’ve found this email marketing guide useful. As you can see, with a couple of smart moves, you can create a cycle in which your mailing list is continuously going to grow. As the market is constantly changing, remember to use one of the abovementioned tools, as they will make it much easier for you to test, experiment with and optimize your email strategy for the best performance.
If Objective-C isn't your thing, their is Titanium from Appcelerator, you use JavaScript to build your app and it gets compiled into Objective-C. Mobile Tuts has a nice tutorial on how to consume the Twitter API, which is also REST based. It should give you a good foundation to get you started. (http://mobile.tutsplus.com/tutorials/appcelerator/appcelerator-using-json-to-build-a-twitter-client/)
Email marketing has the highest conversion rates of any marketing channel. In fact, sixty-six percent of online consumers made a purchase after receiving an email marketing message — which is more than social and direct mail, according to the Data & Marketing Association. And transactions from email are three times more profitable than those made on social media, reports the global management consulting firm McKinsey & Company.