The functional service RSS is www.inoreader.com
this is Clarified by a long study of all the available products today. And in addition to numerous other settings, there is a default option to subscribe to rss VK, Facebook, Twitter and others. Plus to add to it this service and you will be able to read and configure all that is in the most popular social. networks and services: feed.exileed.com/?lang=ru
feedly.com generally a quiet horror compared to inoreader.com I think they are the only ones who did not hear about the second service.