I guess "I believe this is correct." would be more polite. But on a social media site where everything is about prompting the next comment, and no one can unilaterally end any conversation, it's obviously toothless. In that context, the "polite" alternative could come off as tentative.

I hadn't heard "twitterism" before. Is there a list of these? I unplugged from Twitter more than a year ago, and have benefited immensely. But I'm sure I'm missing references because of it.