We can find out lots of note apps on App Store, but if you want to share your notes through various social networks, Note & Share may e more suitable for you.
Note & Share is a practical note app developed by Ignition Soft Limited, and designed for both iPhone and iPad. The universal app concise and clear user interface and powerful note functions, and supports TextExpander, Markdown, word counter and built-in URL shortener. And you can export HMTL to clipboard, share images or web page with bookmarklet. Most importantly, the note app also features powerful sharing function, which allows you to share your notes via Twitter, Evernote, Facebook, Plurk, Dropbox, Google Docs, SMS, Email, clipboard and local note, and it also supports hash tags/notebook on Evernote.
Note & Share with a size of 9.8 MB is compatible with iPhone, iPod touch and iPad running iOS 4.0 or later. The universal app is priced at $0.99 ($3.99 regular price). If you’re interested, jump to App Store for more details.