The versions here don't work with Twitter or identi.ca any more. They only
work with GNU Social (formerly StatusNet). You may like to try
https://f-droid.org/packages/org.mariotaku.twidere or https://f-droid.org/packages/org.andstatus.app, for Twitter; or
https://f-droid.org/packages/org.macno.puma for identi.ca.

Mustard is a full-featured client for Statusnet / GNU
Social, a microblogging platform somewhat like Twitter, but decentralized. Note
that the hitherto largest Statusnet site, identi.c