A little common sense for more security on the Internet!
Avoid publishing texts or images that devalue yourself or others: they could be used later, for example by your future employers:
use search engines regularly to find out what is visible on the net;
if a problematic image or information is detected, react quickly by requesting its removal from the person/site that published it. If the problem persists, don't hesitate to lodge a complaint;
"On è tro bô sur cet foto! Mdr". Beware of style, spelling and tone, which can lead to similar responses. To maintain enriching and constructive exchanges, let's be... enriching and constructive!
don't say online what you wouldn't say face-to-face. Behind your screen, you may feel more confident and uninhibited, but that's just an illusion: the consequences can be far more serious: "Words fly away, writings stay" ... ;
do not publish insults and/or threats online, even in the name of humor: these are incitement to hatred, and therefore punishable by law.