There are umpteen online tools available. Here are a few I use a lot and recommend. Several of them are well known, but there could be a few you’ve missed.
Buffer is a great automation tool. You set at what times of the day you want Buffer to post to your connected networks. You can add to your Buffer with one click from Feedly, or the Chrome extension.
Bufferapp website http://bufferapp.com/
Dropbox is first of all a file sharing tool. You can use it in your browser, mobile app or computer application. You can share folders with other users. But this is just the basic function.