I Can't Update Twitter App Because it's linked to someone I have never met

Question

I can't update the official Twitter account. For some reason the Twitter app is connected to someone else's Apple ID – someone I have never met nor do I have any mutual friends with (according to fb). Whenever I try and update Twitter it asks me to sign into his account and I can't update it with my account. I haveeven  deleted Twitter and tried to reinstall it using my Apple ID. When I do so his email address is automatically filled in (with every other app mine is automatically filled in) – so I filled in my Apple ID info but I get an "Unknown Error" and then "We could not complete your request. There was an error in the App Store. Please try again later. (4)"
It appears that I'm not the only one who has had this problem
https://discussions.apple.com/thread/3147823?start=0&tstart=0
https://discussions.apple.com/message/13011607#13011607
But from what I've seen the only solution is to re-index my computer with spotlight. I have done so but that doesn't work.
I just want to be able to update Twitter. Help?

Answer 1

Hi Brian...
No guarantees, but try deleting the cache and cookies associated with the App Store.
Go to ~/Library/Caches/com.apple.appstore/Cache.db
Finder, hold the Option key, and choose Go > Library
Move the Cache.db file to the Trash.
Restart your Mac.
Deleting cookies may also help.
Go to ~/Library/Cookies. Move the com.apple.appstore.plist file from the Cookies folder to the Trash.
See if you can update Twitter.
You can report this incident to Apple >  Apple - Support - Mac App Store - Contact Support