Sponsored Tweets at least announced that the content was advertising.
I think this language will just lead to advertising without proper
disclosure by the user (which was used in keeping with the FTC ruling
on this issue). Some celebs & bloggers will still accept money & Tweet
about products, just without indicating publicly that they've been
Also, you say "We don't seek to control what users Tweet" but that's
exactly what you are doing by preventing users from Tweeting
advertisement should they wish to. I know you can set whatever rules
you like regardless of how they affect people or developers but don't
make a ban on using Tweets for certain kinds of content and then say
that you're not trying to control the content. Clearly, that is what
you're doing. That's what a ban is, exerting your control over
content. In my opinion, you've picked the wrong target.
I'm also not sure how "paid Tweets" by individual users is any
different from commercial/organization accounts using Twitter to offer
discounts, specials, sales, etc. Why does the advertising ban apply to
individuals and not to companies?