@tom79 Not exactly :-)
GNU Social extends obsolete Twitter 1.0 API, but some APIs are different, see e.g. implementation in #AndStatus https://github.com/andstatus/andstatus/blob/master/app/src/main/java/org/andstatus/app/net/social/ConnectionTwitterGnuSocial.java
One of very important features that I didn't implement yet: Groups
See https://github.com/andstatus/andstatus/issues/248#issuecomment-219826572
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