I hadn't even realised that they had a profile on me even though I've never participated in their site. I've now opted out, but I suspect doing so has fattened

I hadn't even realised that they had a profile on me even though I've never participated in their site. I've now opted out, but I suspect doing so has fattened the profiles of everyone I follow as verifying Twitter id to opt-out meant granting access to who I follow for a brief moment.