A friend recently asked me for a Like Us on Facebook Poster. I thought it would be dead easy to find via Google but I couldn't find one. So I have created one and here it is. Please feel free to download and edit. I have created several versions so choose the one which is easiest for you to edit. I suspect Powerpoint version will be easiest for most (assuming you have Microsoft Powerpoint). If there is a version missing that you would like then drop me a line at firstname.lastname@example.org and I'll see whether I can help.
GIMP Version (in zip file)