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IBM Connections has rich support for iOS mobile clients (4.5 out of 5 stars) and Android devices (4.5 out of 5 stars)
Jive's social business platform has been designed from scratch as an enterprise social network.
Jive has separate clients for iPhones and iPads, but both are highly rated (~4.5 out of 5). The Android version ranks 3.5 out of 5.