Recs.
Updated
Inoreader lets users subscribe to social networks and see a feed from all sources in one place.
It's available as a Chrome extension, a webapp and as a native app on iOS, Android, and Windows Phone.
The price ranges from free to $5 per month, depending on which plan you choose.
SpecsUpdate
Pros
Cons
Con Price change / Feature capping instituted
In February 2019 Inoreader announced that the "Professional" plan will be capped (big change from unlimited filters to just 30!):
Based on our observations, the new premium feature limits on the “Pro” plan are as follows:
10 Rules - *** Increased to 30 Rules after Inoreader evaluated feedback from their users.
30 Active Searches
100 Boosted Feeds
30 Social media feeds per service (Facebook, Twitter, VKontakte).
These limitations will be applied to your account at the start of your next subscription period. All features that you use above the new limits will be deactivated, and only those that were created earliest chronologically will remain (For e.g. your earliest 10 Rules created).
Con Can't have unread items older than a month
If you don't read items older than 1 month they are automatically marked as read, with no possibility to "unread" them.