People over 50 are the fastest-growing group visiting online dating sites. Not all networking leads to romance. But—romantic or otherwise—about half of boomers who go online maintain a profile on at least one social network.

That's how Nancy Clark, 76, met her current flame, Gene Young, 71: They bonded over recipes in a cooking group at Eons.com, an online community aimed at boomers. 

"I met Gene in 'Cooking for One or Two,' " says Clark. "After my husband passed away, dinner was the loneliest time for me. Gene and I sometimes Skype over dinner, showing each other our concoctions on our computers."