RSS feeds data

RightComposition[
Import[#,"XMLElement"]&,
Cases[#,XMLElement["outline",{"text"->_,"title"->t_},___]:> t,Infinity]&,
Sort,
Export["~/Temp/RSS_feeds_original.txt",#]&
]["/Users/meng/WorkSpace-meng2maclap/Temp/feedly-98a48f53-5b0d-4207-b7c3-8faeee818fdc-2020-05-08.xml"]

SystemOpen[%]

RightComposition[
Import[#,"XMLObject"]&,
Replace[
#,
XMLElement["outline",{"type"->"rss","text"->_,"title"->_,"xmlUrl"->_,___},__]:> XMLElement["outline",{"type"->"rss","text"->"Twitter / lumeng","title"->"Twitter / lumeng","xmlUrl"->"http://twitter.com/statuses/user_timeline/14663976.rss"},{}],
Infinity
]&,
Replace[
#,
XMLElement["outline",a:{"text"->_,"title"->_,___},list_List]:> XMLElement["outline",a,DeleteDuplicates@list],
Infinity
]&,
Export["/Users/meng/WorkSpace-meng2maclap/Temp/feedly-98a48f53-5b0d-4207-b7c3-8faeee818fdc-2020-05-08_skeleton.xml",#]&
]["/Users/meng/WorkSpace-meng2maclap/Temp/feedly-98a48f53-5b0d-4207-b7c3-8faeee818fdc-2020-05-08.xml"]

RightComposition[
Import[#,"XMLElement"]&,
DeleteCases[
]["/Users/meng/WorkSpace-meng2maclap/Temp/feedly-98a48f53-5b0d-4207-b7c3-8faeee818fdc-2020-05-08.xml"]