My ex is lying on twitter - saying I made her bankrupt - what should I do?

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Background is 6 years ago she got herself in financial difficulty - got a £60k loan to pay off all her debts - which (stupidly) I co-signed. She carried on spending and soon enough couldn't make the repayments - so she declared herself bankrupt to get out of it. Of course that meant I was liable for the full amount, I struggled on for a couple of months but then I had to declare bankruptcy as well. Needless to say we split up over this issue.

Now she is saying I ran up £76k of debt "half of which she knew nothing about" on twitter.

I know I should ignore it - but she makes me so angry - especially as she is very prone to calling in lawyers against various internet forums she is a member of for spurious reasons.

Should I ignore it? should I sue? Can i sue?