1. It doesn't grab anything from your page. You create a plug thumbnail yourself.
2. Most sponsors probably don't care but some are more strict than others over how you use their promo materials so read their terms or ask them if it's okay.
You are directly promoting the sponsor since the plug has to match the content. It's also in your best interest to promote that sponsor on the landing page since the surfer intentionally clicked on that plug and is interested.
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