This method has been broken since Tweepi updated to version 2.o – but one of my kind readers has been nice enough to make a plugin for both Firefox and Chrome.
Firefox: https://addons.mozilla.org/en-US/firefox/addon/tweepi-v2-select-all/
Google Chrome: https://chrome.google.com/webstore/detail/kpniicpnanbaopgkcagaphglbeaejnph
Everyone be sure to thank @Jakob for his amazing work!
One of my favorite twitter management apps Tweepi (Free BTW) became a little bit harder to use following letter from twitter, (See Below) and while I completely understand them having to disable the “Select All” feature, it doesn’t mean I’m not going to do anything about it!

Dang Twitter TOS!
Oh well lets fix it!
Your going to need three things:
Firefox – Download (and if your not already using Firefox, Slap yourself)
Greasemonkey Firefox Plugin – Download
“Check Boxes” Greasemonkey Script – Download – Author
BAM! your tweepi problems have been solved!
the next time you load tweepi this will show up at the top of the page:

All you have to do is click “All” and it will check every twitter user on the page so you can, Follow, Unfollow, or block the user, whatever you need at the time.
Hope this helps, Leave a comment if you can’t figure it out.
plz don’t ban me for posting this Tweepi, I <3 you!!!




Hey,
These scripts do not work anymore since tweepi has been upgraded to version 2. Do you have new scripts to check the boxes for this new version? Any respond would be much appreciated.
Regards
@Harris — For right now you can click “Take me back to the old tweepi” in the top right hand corner and they still work..
I’m not sure if this hack will be able to port over to the new version of Tweepi, but I’ll check it out and update the post if there is a way.
That was a big time waste for me, so I just created a plugin to fix that: Tweepi v2 Select All
Firefox: https://addons.mozilla.org/en-US/firefox/addon/tweepi-v2-select-all/
Google Chrome: https://chrome.google.com/webstore/detail/kpniicpnanbaopgkcagaphglbeaejnph
Enjoy