Hello Paul,
I am really sorry for the delay of this reply as it is a weekend for us here. Currently it's not possible to set a maximum character for the app but I have added this for you and you can now configure this in the EasyDiscuss app settings for EasySocial. I have set it to 250 for you and it will truncate it at 250 characters now.
By the way, I noticed that for some reasons your login popup input text has a crazy padding so basically even if you type anything, you can't see it
. You can fix this by adding the block of css codes into your template's css file,
#login-form input {
height: 40px;
}