Popular offline reading and bookmarking service Instapaper has announced that it will be leaving Pinterest to go its own way, only two years after the social media platform acquired it in August of 2016. Instapaper was one of the first apps on the App Store back in 2008, developed by Marco Arment who is more recently best known for the very popular podcasting app, Overcast. Arment sold Instapaper to Digg parent company Betaworks in 2013, and the service…