Is it just me or do others completely balk at signing into sites with Facebook?

For some reason my survival instinct kicks in - sort of a combination of fight and flight simultaneously. I wrestle my way around it. I just went to http://gtrot.com and it asked before running the search on my city if I wanted "Friend-powered personalization." Happened with Trip Advisor too a couple of days ago. It's total submission. People on Facebook are not automatically my friends, they're just Facebook friends. But that's just a side point.. I'm put off by sites that are only, or compel a Facebook login. I don't know or even trust what is or what will happen behind the scenes.