www.MyTweetAlerts.com is like Google Alerts but for Twitter. You can receive alerts and get emails when someone tweets about some topics and the tweet has more than X likes or Y retweets. You can also get emails if someone tweets about some keywords and he/she has more than X followers. So it is really useful to find tweets that can go viral.
Discovery the truth about your brand and your competitors on Twitter. With the latest AI innovations in Sentiment Analysis, when can show you how people tweet and feel about your brand.