Sorry that this happened to you, it's a shame when some people have to pick on others for no good reason. I'm not sure how accurate to the textbook I am on my definition, but I believe that spamming is a repeated phrase, word, movie etc. that is either a)unnecessary or unimportant or b)excessively rude and purposely malicious. Putting out a couple of movie clips in a row or maybe an ad or two every few minutes is neither unnecessary or purposely meant to be rude and disruptive, so in my books you're in the okay. Don't worry too much though, it's most likely that those people were either trying to pick fun out of you or were ignorant on the topic themselves and were wrongfully accusing you.