Block Together - A useful tool which helps you block trolls on Twitter.
ilo - Premium Twitter analytics
Secateur - Use Secateur if you want to temporarily or permanently block or mute (or both block and mute) a Twitter account and all its followers.
Accountanalysis - A tool to evaluate Twitter accounts
Moderate - Identify, mute, and block trolls in your Twitter feed
Seekmetrics - Instagram, Facebook and Twitter Analytics.