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From the people who brought you Tweetbot comes Netbot, a Tweetbot-like client for the new App.net social media platform. If you're fed up with Twitter's move to force ads into your timeline, this might be an easy way to transition.
This is a social network that lets you have private conversations with multiple people. You can arrange boards for different people to post on, and only those invited to the board can ever see what's going on. Apart from the benefit of keeping private conversations private, you don't spam all your mutual friends/followers on other platforms.