Adding a divider line to the easysocial dropdown module menu?

Hi there, I would love some help on this as I am a little stuck on this one. Basically if you login to my site you get a menu in the top right hand corner which is a easysocial menu from the module easysocial dropdown and you can have any menu item you wish in it. This menu will be very large on my site as I am using most features of easysocial and therefore I would like to break up the sections with a little horizontal lines.

Specifically this is the menu I am referring to here and please notice in the second have of the video I show the facebook dropdown menu which has these horizontal spacer lines that separate out groups of functionality in the menu: http://recordit.co/qOwfyoYKN0

To be clear here I am not talking about a divider line after every menu item, I am talking about a divider line after say 3 menu items and then after the next 4 menu items etc kind of like facebook do it.

So my question is how do I get a similar type of divider horizontal line into the menu to create a visual breaking up of the menu and make it easier to view. I hope I am explaining this right and any help would be much appreciated as I am sure others have a similar scenario when it comes to large network type websites.

thanks in advance,
James