I think it is safe to say that with more people spending time online now that there is going to be a rise in cyberbullying, fraud etc. Just make sure you are keeping tabs on your children's online activities - without being too much of a nag.
Also, at this time a lot of people are feeling insecure about their future and are probably more vulnerable to some of the ridiculous things being posted online.
As we are all cooped up at home, it's probably a good idea to schedule in some daily 'screen free' time, or activities that don't involve going online. There are some great tips about dealing with lockdown boredom here that you may find useful.
www.cybersmile.org/blog/how-to-stay-positive-during-lockdown-and-self-isolation