For android download "Pocket" to read articles latter.
Dawn News, BBC News, CNN.
Search MCQs, GK, Science Apps. in Play Store there are good ones.
Download PDF Notes, Journals etc and Read them in Adobe Reader.
Download Aldiko Book reader software if you want to read some books like novels, Philosophy, Psychology, History, Etc.
For Twitter, First search Good Websites of your interests and find their twitter account.