These are tiny sharedrops to get people to notice the coins.
You can think of it like spamming the chain to get people to notice your new token.
When I get these, I usually move them to a second account, so they don't confuse me when I look at my main wallet.
We get the same thing happening on steem when someone sends you 0.001 SBD and then spams you saying "please upvote my post"
Thank you for the kind explanation @intelliguy.
Appreciate the idea of where to store them as well.
All the best.
Cheers.