How can I can tell if he's trying to flirt with me over snapchat?

Anonymous
This guy I know added me on snapchat and has been snapchatting me a lot lately. I dont usually repsond but he keeps sending them anyways. Sometimes they're of him or something he's doing. I can't tell if thier just mass snaps or if he's sending me stuff personally. He some of the stuff he sends me end up on his snapchat story but some of the stuff he sends me doesnt? Is this his way of tryin to flirt/ interact with me? should i snap back? or do you think he's doing this to a bunch of people? Why does he keep sending me things if i rarely ever respond?
How can I can tell if he's trying to flirt with me over snapchat?
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