Lately tox.chat (https ://tox.chat/index.html) a P2P Instant Messenger took my interest because it's FOSS, decentralized and cross-platform. You can even run your own Server as a Bootstrap Node (https ://wiki.tox.chat/users/nodes) Most of the clients already include encrypted (Group-)Chatting, (Video-)Calling, large File-Sending, etc... In conjunction with a TOR-Proxy it also has a high privacy standard. Info: Please note that the clients are still under heavy development (Alpha-State)! ...I will certainly stay tuned into this project
Hey, sorry I know this is well past your post date, but facebook only collects browsing data to target ads, MDL can't help with that LOL