Yup, it scares me too. I've made multiple facebook accounts - one with Legal Name, one with Would Be Legal Name if not for $, and one with our name, which has no relation to Legal Name. And even with the third one, they suggested we friend our biomom. The first one and second one I can understand. The first one is, duh, Legal Name.

The second one differs in only first name. Our last name is really rare here in the US, so I can see their algorithms going "oh, well, there's this family of [legal last name], so maybe she's tied to them. :D". (even if biomom doesn't have me and my brothers' last name anymore.) But, weirdly, it hasn't suggested that I follow either of my brothers, so.. IDK.

But the third? There was absolutely no reason to connect that name to the biomom's. It creeped me right the hell out.