Nice thing is that you can see all you Gmail contacts online and have gchat with them in hangouts. You can now make voip calls with hangouts and do video chat as well with one or more people.
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I have a work and personal phone and I don't consider it overkill. I like to keep things separate... I have an S5 for work and a LG G3 for personal.
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You can use tweet caster. Nice thing about that app is that it's easy to switch between accounts if you have more than one twitter account.
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