As @clairestreb says; You do have to wisely pick your battles - otherwise you’re just wasting your own time which could be spent productively learning something new that is useful for your own growth. And yes often the bullying accounts being used are fake accounts, but there is a real person behind them - only emboldened by their anonymity to insult and bully - but still able to be reached.
Assuming that you thought a particular scenario was worth taking a stand on, I guess to start with you’d have to do some research and understanding on what motivates a bully… Ego, low-self esteem, part of a pack, jealous etc. ?? It probably shouldn’t take long to figure out who is the main ‘instigator’ and who are just the people who can’t even think for themselves and as you say ‘just wolves circulating to devour them’ (great analogy). Don’t bother talking to these bystanders.
Once you’ve done that try to figure out the core emotion of a bully’s comment - if someone is posting personal insults, the core emotion is likely anger, and they might be masking a range of insecurities. Ask them very short simple questions to get them to think about their core beliefs. Don’t give them any answers at all about what you think - ask them questions to get them to reveal more about themselves, to which you can ask more questions - which in turn makes them think about their own actions (which their conscience is no doubt condemning them for engaging in this behavior). If they continue to insult you could simply ask ‘Why are you so angry?’. If the person is an atheist, perhaps ‘Why are you so against Someone that does not exist?’.
If you can get a conversation steered towards one of the big 4 question areas about worldview (as outlined in the Intro RZIM course), you are planting seeds of doubt in their mind about their base worldview assumptions and it forces them to go away and question themselves. It is going to require very tough skin, and maybe think of only one post for the day - in the form of a question - and then let them rant and rave a little about it. Maybe if an insult is directed at you and only you, you could ‘like’ the insult comment and say nothing. Silence is still a response. That might make them think some more.
Of course, we are not able to do any spiritually lasting good at all without God helping us, so pray about it before you type a single word.
It’s probably wise to discern between insults, and personal threats, and I personally wouldn’t engage anybody at all who was using an excessive use of profanity (Don’t cast your pearls before swine principle)
Good luck - and remember we won’t see the results of seeds sown until eternity. It may be that a single question asked of a person is the start of them actually starting to consider the claims of Jesus Christ.
Hope that’s helpful…
How do you think the earth came into existence?
How do you think human life began?
What is the purpose of human life?
How do you determine good and bad?
Destiny: What will happen at the end (at death)?