Anything put online in such a site is "out there" for what you can consider an eternity. Even if you delete it, someone can screencap it and you no longer have any power to remove your words from the public sphere. People with influence over your life can come across such material, and that may have ill consequences. For this reason and out of respect for those I converse with, even if I voice a less-than-popular opinion or disagree vehemently with something said, I do so in a manner that is not overtly disrespectful to others.