Always read the policies for posting for every sight you tend to use for uploading on or even link sites between,cause somewhere in the depths of text is some simple and valuable findings on what will narrow it down to what you can post or want to from there,then determine if you want anything tagged,if you truly dont want your art spread around being used as icons for others and so forth,give a description,and to go the full length put your watermark over it, you know how the typical photographers do HUGE logo and copyright but very transparent. However, you must remember all artwork and post should be legally viewable to the audience ages of 13+ to reduce any warnings on account deletion,so forth.Heres ToS for FB http://www.facebook.com/terms.php and honestly it wont take too long to read what you need out of it. Hopefully the rest will fall under your replies here,have fun girl!