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.
Alternative products to Timeline
2 alternative and related products to Timeline
Twitter in your OS X notification center
2 Alternatives to Timeline
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