This was exactly my problem, any time I tried to disconnect my Twitter account from Ask.fm there wasn't an option to remove it. I tried everything and nothing worked, but today I found out how to do it.
Upload Two or More Photos in One Tweet on Tweetbot [HowTo]
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So, on my Twitter account sometimes it useful for me to upload two photos in one single tweet so people understand what I'm talking about, the thing is, I couldn't find out how to do it!
I use Tweetbot on my iPhone, once is the best Twitter client I've ever came across, it's definitely worth its price, so check it out on the AppStore and buy it!
Let's get to the point now.