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I've started to use Telegram recently and liked it very much
telegram is not in list
I prefer Skype but why this is not safe? Not safe for regular activities or you meant it is not good for those who talk/chat for illegal plans?
Anyway, If there was Discord on the list, it could be the winner. Sadly, Discord was not available in 2012 I think.
Pidgin is my favourite. It also supports OTR.
I use both Facebook and Skype. But Skype has the ability to send documents, so i like it best.
If to say about this list here ,then facebook messenger.