I wouldn't be forthcoming at all about your future plans. An employment relationship is a mutually beneficial agreement yes but at least in most regions and situations you are perfectly at will to terminate employment at any time for any reason and labor laws aside your employer has equally such a right.
Because of your ability here to make this decision and the fact that you want the most possible compensation for this arrangement while your employer is seeking to provide the least possible compensation, the best mindset to take is to view the relationship in an adversarial sense. You put no trust in them beyond what is written on paper and agreed between you in the terms of your employment.
Let me give you this analogy, if you were competing in a chess match with a cunning rival where prize money was at stake, would you divulge your thought processes about what you think they will do, and you might respond and counter? Certainly not, because you are revealing your strategy and this, at best, has a net zero influence on the outcome of the game. At worst your opponent sees a number of weaknesses in the information you volunteered and moves to exploit them, or sees how weak their current position is and strengthens appropriately.
By not telling them there are no consequences. Your long term plans might as well be a manic episodic spur of the moment decision to travel the globe. They couldn't punish you by pretending otherwise. Telling them your long term plans could affect how they treat you or whether they want to keep you.
Excuse my language because I don't mean to be offensive, but there is no strategic upside to this other than what I suspect is a slightly narcissistic advertisement of who you are, and what your goals and dreams are, perhaps for the reasons that you get a boost to your ego being a contrarian or by attracting attention to your perceived uniqueness as an individual. Generation ME and all.
I suggest separating your social media life from your work life, changing language from "long term goals" to "hopes" and "dreams" and then you get the best of both worlds in the appropriate places for each. You should portray yourself as different from who you really are to your employer because it is advantageous for you to do so.
On a side note, if you happen to find a job in IT that actually makes the world a better place instead of being directly or indirectly involved in a corporate or vampiric enterprise of some kind that makes the world worse off then please let me know. I am beginning to think such places are extremely rare. :)