Inoreader lets you subscribe to RSS Feeds, Blogs, Podcasts, Twitter searches, Facebook pages, and Email Newsletters. You can use Rules to set up entire workflows, such as sending push notifications and emails or marking as read when certain criteria are met. You can use Active Searches to create a search query and all posts mentioning that query will be delivered as a news feed. You can filter out or permit only such articles that match specific criteria from your feeds.