OfferUp, 5miles, LetGo, etc.

I just joined OfferUp. Well, I downloaded it a year ago and ignored it, but finally used it to sell stuff on yesterday. Sold my whole comic book collection for $30 within an hour (as a lot), and sold a post-hole digger today. I'm already getting creeps asking about comics on my garden tool posts, and I am in the process of helping some young woman with her landscaping because she replied to my post about one free 50 lb. bag of free gravel and turned it into a conversation.

Does anybody else use these apps? Is everybody who uses them weird?

Also trying to give stuff away. For free! I am getting bombarded by people asking questions about the item and when I'll be available, and so much else. Should I just leave it on the curb and mark it as sold once I notice it's gone?