Who should use it: Everyone. The diversity and amount of active users on Facebook offer the best likelihood for you to reach your target audience on a large scale.
Most effective content: Copy + image (although you can refine what works best with your customer by running split test ads). Images account for 75-90% of Facebook advertising performance.
The most effective ad title length is four words and 15 words for a link description. Include an attractive offer to encourage interaction (39% of users like or follow a Facebook page to receive a special offer).Try and make your content as unique and eye-catching as possible.