A valid clarification, Kaleigh and thank you for not taking my original tone too much to heart.
I personally don't have any experience with Facebook, I avoid that site like the plague. But you are right, others probably use it quite frequently and so their experiences would be related, I had not thought of that.
Like a lot of things in EVE when it comes to RP, it's really going to come down to how we, as a community, choose to perceive it as a greater whole. Since it's not like CCP is going to come forward and declare "The Like button is an OOC feature and should not be considered IC." We agree wholeheartedly that it's going to come down to individual player perceptions.
A point on the "my character would or wouldn't do this" comments. You are correct, and it's a point I've made before, that a character is a lifeless, inanimate thing without the player behind it and that it is the player's choice to stick to their perception of what their character would or wouldn't do. For some of us, this distinction is easy, for others it isn't. There have been several times that I, as a player, have wanted to do something but didn't because my character simply wouldn't do it. (This is most commonly seen when I played Raze and specifically opted out of several fleet and militia operations because they clashed with Raze's "defense only" philosophy. In the end, it is me deciding to uphold Raze's viewpoints, but the scope is that Raze, the character, wouldn't participate and chooses not to, not that I, the player wouldn't.
If people choose to use the "like" function as an in-character endorsement, I would probably offer the same justification to them as my OOC justification. That being that Malcolm would argue that it isn't an "endorsement" it's a "I thought this was a very well constructed post and could respect it, even if I disagree with it" in most cases.