Two times today I responded to a conversation using iMessages on my macbook air, and two times it added contacts to my conversation. The conversations had 2-3 participants at first, and had 5-6 after I responded. It said in gray, "you added ....... to the conversation." I definitely did not add anyone to the chat. Anyone have any experience w/ this?
MacBook Air, OS X Yosemite (10.10.5)