According to their wedding Web site, "Twitter lovebirds," Chris Wardzala, 23, and Magdelyn Skacan,24, met on the microblogging service in 2007. Both tech enthusiasts with similar interests, they started following each other and reading each others' tweets.
Wardzala said they started talking about tech issues he was having and then moved on to movies.
One thing led to another, and as tweets led to e-mails, phone calls and visits, their relationship grew. Now the Chicago couple plans to get married in September.
"It was really easy to get to know someone because you see some of their thoughts and ideas in a way that is sort of uncensored," he said. "You get to know someone really easily."
Spira said social networks also provide places for new acquaintances to become better friends.
"Quite often you will meet someone at a party or business networking event, exchange cards, and become Facebook friends," she said. Status updates, pictures and comments on a member's profile give people clues about a potential partner's dating status.
Kate Lovett, a 22-year-old graduate student at the University of Utah in Salt Lake City, sent a Facebook message to the man who is now her husband only after his profile indicated that a possible girlfriend was out of the picture.
She said she met him during a fire drill in November 2008, while they were both students at Brigham Young University.
Instantly attracted, she decided to look him up on Facebook (on a college campus of 30,000 it's likely among the easiest ways to find someone). But when she saw pictures of him with another woman, she thought better of sending him a note.
Four months later, however, Lovett still found herself thinking about the guy she'd met that winter evening. So she looked him up again and noticed that pictures of the other woman were gone.
She sent him a note and they met the next day. After nine months of dating, Kate and Alexander married this past December.
If not for Facebook, she said, "I probably would never have run into him again."
But though Facebook and other non-dating social networks have successfully played Cupid for many couples, dating experts say it's likely not a replacement for sites like Match.com and eHarmony.com.
"Facebook is a terrific compliment to traditional online dating sites. I don't believe it will replace online dating sites, just like I don't believe that online dating sites will replace traditional matchmakers," said Spira.
Hoping to capitalize on Facebook's fertile ground for romance, some companies are starting to roll out tools that make it even easier for people to meet online.
Moonit.com, a relationship compatibility Web site, plans to release a new matchmaking tool this weekend that lets any Facebook user "moon" two of their friends.
The free service allows a member to select two friends, run their profiles through an online compatibility test and then send a personal message of introduction.
Though the site incorporates astrological information in the algorithms it uses to calculate compatibility, the founders say Moonit isn't intended to be only for the mystical among us.
"It provides an icebreaker," said Mason Sexton, president of Moonit. "This provides something to talk about that is entertaining and witty but also is going to add some value."