Singles websites are big business, they are all over the internet. It is a good guess that at least 25% of the advertisements you will see on the internet are for singles websites. Most single people don't want to stay single; especially LDS singles.
Members of The Church of Jesus Christ of latter-day Saints beleive that familes are eternal. If marriage is performed here on the earth with the proper authority in a one of the Lord's Holy Temples, that marriage can last for ever, not just till "death do you part". Hence, LDS singles tend to look for other LDS singles with similar beliefs and who live in accordance with specific moral standards that enable them to enter and be married in a Temple of the Lord.
For these reasons, LDS Singles Websites are quite prevalent as good business models and new websites spring up or go down every year. These singles websites may be similar to other singles websites - helping people to find friends, dates and a spouse - but they are special in that they also have the added focus of helping LDS Singles find eternal companions.
The following table is not all inclusive, but is a small comparison of some of LDS singles sites.