Facebook has now made a lot of improvements to it's Slideshow Ads, announced last fall. This form of ad is typically done to address emerging markets with bandwidth issues. Advertisers will now be able to create ads right from their phones and add text/music and photos. If you don't have your own photos, then you can pick some up from Facebook's own stock library.
Slideshow, when it was launched, was typically focused on bridging the bandwidth gap. Initially, ads consisted of five to seven photographs, each running for a couple of seconds. Photos would consume just 20% of the bandwidth that videos did. They did play a lot quicker.
However, with this revamp, you will now be able to add sound, enabling you to provide a richer experience. Along with this, you will be able to include, text, photos. You would think this to be a bummer, for the entire purpose of this medium is to solve the bandwidth issue.
Facebook has been clever to market these changes and it noticed that many major brands in high bandwidth markets were keen to adopt this medium to advertise. Pretty good move, if you ask me.