A friend of mine tried to place an ad to promote a FB app, and got the following rejection notice:
* The text of this ad contains excessive or incorrect capitalization.
All ads must use appropriate, grammatically correct capitalization. The
title of your ad, as well as the first word in each sentence, must
begin with a capital letter. Lastly, all proper nouns and acronyms
should be capitalized. As per section 4 of Facebook‘s Advertising Guidelines, all ads should include standard and proper capitalization.
* The text of this ad does not contain proper sentence structure or correct spacing. As per section 4 of Facebook‘s Advertising Guidelines, all ad text must be in logical sentence form and contain grammatically correct spacing.”