I am a user of TweetChat for twitter chats and we are a big fan. Its the only app we use. All other apps seem to be dead end or add nothing new. TweetChat is the perfect example of adding value to social media by building relationships between users who are interested in the topic of the conversation. It has its own hashtag so that people can find topics they want to join, and also many other apps don't have their own hashtag. This makes it really hard to get into those conversations. In addition to the hashtags and chats, you can send private messages to other users, which I think is really useful when trying to connect with them. And, its free!