Both Instapaper and Pocket offer an easy way to save articles and other content so you can check it out later, but soon Facebook might be offering up a third option: the social network is currently testing a new feature that lets you save links posted to Facebook for later reading. The feature is showing up for some users in Facebooks mobile app — when you use it, articles show up in a saved menu listed alongside your Facebook apps. Whether or not the read-it-later tool becomes a permanent part of Facebook remains to be seen, as the company is known for experimenting with features that are ultimately abandoned.