Unemployed after 1st postdoc, what should my affiliation be when introduced during campus visit & job talk? I finished my postdoc last year end of Aug. and have been unemployed ever since (not completely, I've been doing freelance work to support myself, but not research-related). The rest of time I've spent (1) applying to academic positions (mostly R1, some R2), (2) finishing writing manuscripts leftover from my postdoc (although I haven't submitted yet, except 1 which I'm only co-authored that's already published) (3) reviewing journal papers (apparently I'm still being asked), and (4) studying to get a professional certification (which IS related to my research, although  getting the certification itself is not ever required for people doing research in my field, but the process of getting the certification contributes to my research). 

So I have been getting several interviews from R1 institutions and been invited for campus visit and job talk. When I applied, it's clear on my CV that I stopped having academic affiliations since the end of my postdoc (I didn't try to hide it or fudge it). And at no point did anyone asked me what I'm doing since my postdoc ended during the initial interviews. 

But now that I have to go on campus visits and give job talks, and they are asking me to give them brief bio so they can introduce me before the presentation and advertise my talk in the department. What should I tell them? Or rather, how should I phrase my current situation, so it won't sound pathetic and put me in a dejected mindset (which for sure will wreck my presentation and self-confidence). What affiliation should go on their posters and on my slides?

I'd like to think I'm not being asked/interviewed for "fake searches". In fact, in most cases, I actually applied after the stated "deadlines" (they are those "open until filled" positions). so I'd like to think no fake searches would last months (and almost the entire academic year). So I don't think they would invite me just to ridicule me or make me the obvious inferior candidate (although I guess this is possible). In any case, I'd just like some advice on how I should handle this. BTW, the end of this year would be 4th year since I got my PhD. And I didn't take anytime off (or ever been unemployed or have a gap on my CV).
How about "I've done my PhD at [PhD university] with [PhD supervisor], working on [PhD subject]. For my postdoc, I went to [postdoc university] to work with [postdoc supervisor] on [postdoc subject]." If you want, you could also say "I did my postdoc at ...," from which a good reader can infer that your postdoc has ended. 

I don't think you need to stress your temporary freelance status any more than that. It's clear enough in your CV and you got an invitation for a campus visit + job talk, so apparently the interviewers do not think it's a big deal. Of course, you should have a good explanation for that gap during on-site interviews.

Finally, try not to worry too much whether you're being invited for fake interviews/to be ridiculed/as a filler candidate. I think mostly you are a bit uncomfortable about your current situation and that's putting some doubt in your mind that (I'm guessing) does not have a basis in reality. Simply concentrate on giving a good talk and having fun chats about the research you'd love to do.