Optimizely - A/B testing you'll actually use.
ShareThis - Grow your audience with easy-to-use sharing tools.
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Shareaholic - Shareaholic is trusted by over 300000 brands, businesses, agencies, and individuals to grow website traffic and engagement 24 hours a day, 7 days a week.
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.
AddToAny - Share buttons by AddToAny, the universal sharing platform for websites and apps.