Someone reposted one of my graphics on Tumblr and it made my heart sink. It's such a silly thing to get upset over, but I can't help it. I am pissed and disheartened. This is the first time I've caught someone reposting my stuff too. Oh well. Time to start watermarking my work again.
Hmmm...so they didn't credit you. I feel you. I would be unpleased if someone shared my stuff without giving me credit/mentioning me.
You can eother give them the benefit of the doubt, and assume they just found it and posted it to share, or you don't and go postal.