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I'm going to focus on what's readily accessible to the bulk of the population.
If you don't want your participation in certain sites going public, then this will be useful.
This is a very particular class of site and like many others we've recently seen compromised, it's highly likely that members would have preferred to keep their identities secret.
The easiest personal identifier that will match you to a site is your email address.
It's a well-known identity attribute, it's unique to you and there are multiple ways of discovering if it exists on a given website. Also consider how you fill out the following form when you create the account: These attributes won't show up on other sites where the address is used, but they can start to surface in other places.
Not just the mechanisms above, there's always legal requests by law enforcement.
Whilst that's unlikely to be the threat that most folks just wanting to remain genuinely anonymous on the classes of personal site we continually see being breached, it's also an unnecessary risk.