The old adage states that when you're looking at something funny on the internet, the most laughter you will likely produce is sharply exhale through your nose. You might be typing "ROTFLOL," but you're most likely maintaining composure. This is generally a good thing. We wouldn't want to be riotously cackling on the subway, or at work, or on the toilet (or wherever else you may scroll.) Laughing at inappropriate times can be pretty embarrassing. You know this if you've ever had one of those laughing fits that you just can't get over no matter how hard you try. Everyone else has moved on, but you're over here blue in the face, trying to stifle another peal.
Laughter can be a weapon used against yourself or others. Luckily, these memes are funny, yes, but you will most likely exhale through your nose while looking at them. So feel free to look at them anywhere, risk-free.