I agree, that particular tweet was not very bright. The same "worldwide, non-exclusive, royalty-free license" to "use, display and reproduce" your content is a

I agree, that particular tweet was not very bright. The same "worldwide, non-exclusive, royalty-free license" to "use, display and reproduce" your content is also in the Twitter terms and conditions, and is standard for any website that allows user generated content. (Including the one you're reading right now.)