Response from Michael Riedijk of PageFreezer
Thank you for review.
PageFreezer provides a full suite of website & social media archiving capabilities. The social media networks that we currently support (Aug 2016) include: Facebook, Twitter, LinkedIn, Google+, Pinterest, Instagram, YouTube, Vimeo, Flickr, Tumblr, Yammer and Salesforce Chatter. More network are in the pipeline like WeChat, Yelp and others.
Posts, messages, tweets etc. from social media networks are all collected through their official developer API's.
If you need LinkedIn or other social media message archiving, please contact our Customer Success team.