Sometimes I do change my mind about stuff. Not that often (I'm only human, you know), but one happened recently. I posted on Twitter about how I don't follow anyone who doesn't follow me back, and a bunch of people responded to me and I thought a bit about it...and...well I have to say that I still agree with my overall point, which is that it's galling that you lose social capital when you follow someone on Twitter. But I also realized that it was silly to carry it to the extent that I did (where I didn't follow ANYONE) who didn't follow me back, because who cares if I'm plus or minus fifty or a hundred people in my follower / followed-by ratio. So I did add some people. I think @louisvirtel and @scalzi are funny. And I think @danceswithfat says interesting stuff. And I will consent to be broadcast to by them.
The other time was when I posted on Facebook how I'd never 'like' someone's Facebook artist page (for the same reason, they're basically asking for permission to broadcast to you). But then someone (Parker?) posted a reply on my Facebook and made me realize that there was really no reason to be so stern with my friends. So now I like pretty much all the Facebook pages that people ask me to like, assuming they're even remotely interesting to me. Also it (in practice) doesn't really matter anymore, since Facebook has altered its algorithms so that you almost never see posts from the pages that you like (unless they pay to promote those posts).
Also, there were those eight years when I hardly used Facebook. And those six years when I said that Twitter was a stupid fad that'd never catch on. And that time that I said Feedly was stupid and difficult to use (but I was right about that. Okay. They changed some stuff and legitimately made it better, and now it's actually good). And the twelve years during which I swore I'd never switch to Mac. And all the times I said that Scrivener was just another way for writers to procrastinate by fiddling around with fancy tools instead of actually writing.