Keeping up with every conversation about your brand or favorite topic on the internet is tough. Talkwalker Alerts brings the most important mentions across the internet (+Twitter) to your inbox for free! So you never have to miss another conversation again :)
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.