This is the first volume of Facebook cover images of the Japanese animation series Oh! My Goddess.  First released in 1993, this series was created by Kōsuke Fujishima and spanned through 9 OVAs, three television series (of 48, 26 and 24 episodes respectively), 1 theatrical film and about 44 manga volumes.  The story centers around a young man who made requst of having the goddess who was graning him a wish stay with him forever, and how their develope their lives and relationship togther.  A preview of the cover images can be seen below:
 

More information about this anime series can be found on Wikipedia and Anime News Network are interested in this series.  You can download the cover images here.