I think I got blocked by one of the horseback riders I follow on Instagram. I noticed it wasn't in my list of accounts I follow, and wouldn't come up in the searches. So I went to one of her friends who I knew linked to her page, and when I clicked the link I got a blank page. So I logged out and did a Bing search and the page came up, but as soon as I logged back in it said it was unavailable. I did make what I thought was a fairly innocent comment, but I don't know if maybe she took it as offensive and blocked me. Her horse had her head on her shoulder, and they were giving each other kisses, and so I commented that I liked the little kisses.
EDIT: Or I might have said love the little kisses, but either way I just thought it was cute, and didn't mean anything offensive by it.