Seniors have discovered online dating and it’s big business. SeniorFriend.com, probably the largest online matchmaking service devoted to seniors, claims almost half a million members. And it’s not the only service devoted to seniors.

Sharon O'Brien, About.com’s Guide to Senior Living reviews SeniorFriend.com and, toward the bottom of the page, several other matchmaking sites geared for seniors.

She also provides some excellent tips about how to use these services safely, and provides other information you’ll want to explore before you plunge in.