If you don't want information you consider confidential about, don't give it away in any shape or form.
I avoid reading blogs. Why? Because people tend to write personal secrets in them. What if a fellow corp member writes on his blog that he is going to betray me. What should I do? I mean, obviously I should ignore this information IC, but my brain simply doesn't work that way, the very knowledge that the character is going to betray me will color his or her IC actions differently from that point on. I can honestly not tell anymore if I would have picked up some hints of betrayal IC without having read the blog, because the OOC info is affecting my vision. Just imagine watching the Sixth Sense for the first time after someone else has told you the clue. No matter how hard you try, your viewing of the movie will be very much affected by that knowledge.
Once you know Rosalund Shaw is a Jade alt, you simply cannot look at her anymore without bias. That means that if you want to keep your alt and connection secret as a player, you should take every effort to avoid having OOC about. Even if I wouldn't use a connection like an image on the same private server as IC evidence, realizing that is the image is on the same server OOC would still spoil my IC interaction with the character.
If you put info into an OOC channel, and that info can be linked to IC actions or motivations, you cannot use the OOC/IC divide as a shield anymore in a nonconsensual game of players with different standards for IC/OOC. You should simply ask yourself, could a non-RP misuse this information and go with that.