Hello Clueso, social media can certainly be a benefit for many people, other times it can definitely be a curse, people making comments that are far from the truth, so do you enter into a battle of what's actually happened compared to what these other people have said or do you block the comment and hope your friends know that it's not true.
If you engage may only make the situation worse because these people could be only wanting to discredit you, but your friends may be thinking the same as you and doubt what's been said and take no notice.
If those who want to criticise you on social media aren't worth trying to compete with, they will always want the last say so try and contact your friends and if need be, tell them of what happened, rather than gossip on social media.
If you need, try and stay away from reading any comments.
Take care.
Geoff.