Use Hashtag App to monitor Twitter, Instagram hash tags
Hashtag App allows iPhone users to monitor hash tags while on the go.
Hash tags on Instagram and Twitter both offer a great way to follow what's going on with a particular topic or event. One providing the conversation, while the other provides an illustration.
Tracking a hash tag in most Twitter apps on the iPhone is a simple process. Tracking a hash tag in the Instagram app takes a bit more work, however. If you have an event coming up and want to quickly and easily follow it on Twitter and Instagram, give Hashtag App (free) on your iPhone a try.
You can either enter a custom hash tag in the text field at the top, or quickly search a trending hash tag by tapping on it at the bottom.
After entering a search term, Hashtag App will search the public Twitter and Instagram streams and display any results in one convenient feed.
Once you are done viewing a particular hash tag, tap on the X to go back to the main screen. That's all there is to it.
The ability to save a search term for quick access is missing from the app and would be a great addition. All in all, the app works as advertised and makes the following of a topic on more than one social network a breeze.