* Classified love, with a twist: When 35-year-old Sondi Moore's forays into the world of Washingtonian classifieds netted her a neat 400 responses to her thrice-run ad, she decided to "share the wealth."

Letters she received in response to her ad were placed in three groups:yes, no and maybe. Of the yesses, "I couldn't go out with all of them," she says. "They sounded nice but they weren't my type for one reason or another.

"I called about 10 of them and said, 'Hi, you answered my ad. Would you like to get together with some of my friends?' Then I invited 10 of my women friends, and we all met for a happy hour after work." Seeing how "20 people who don't know each other fit together," says Moore, a condominium manager, was a good social-learning experience for everyone.

Moore, whose shortest date lasted "10 seconds" and her longest "a couple of weeks," says her goal was to meet different men: If it ended in a relationship, that was fine, but the purpose was not marriage. "I met 60 different men out of the first ad in 2 1/2 months," she says. "There is so much out there, and nice."

Conceding that the "in" thing now is older women/younger men, Moore says she's "always been interested. The thing about getting older is it gives you a wider range to choose from."

* Socializing and finance -- Conversations' lectures on financial topics encourage "an immediate reaching out, an explosion of conversation," says founder Joan Farrell. "There's no pressure to do the mating/matching thing."

Their next meeting: Sunday, Dec. 5, 4:30 p.m., "Money Management and Personal Financial Planning," with Robert S. Hausman, financial adviser with FSC Securities Corporation, and Robin O. Oegerle, president of Financial Stragegies, Inc. (Asti Roseto's, 7940 Wisconsin Ave., Bethesda). Lecture and h'ors d'oeuvres, $15. Reservations required: 657-3357.

Washington Business Connection -- "Let me give you my card..." Your business card is your ticket to this new social/business network for Washington men and women.

If you see someone interesting across the room, you need not be shy. Just walk over and give them your card. It's business, right? Or, maybe a potential date.

Bring your card, yourself and "the most interesting person you know" to the Shoreham (Calvert St. at Connecticut Ave., Woodley Metro stop), Thurs, Dec. 9, 5:30-8:30), $6, cash bar. 966-9606. "The idea is to meet as many people as you can," says Elliott Jaffa, Open University instructor and co-founder of Washington Business Connection.

* Matchmaking, Matchmaking, 1983 Style -- Panelists Joseph M. Hochstein, of The Jewish Week; John Sansing, Washingtonian Magazine; Joan Hendrickson, Georgetown Connection; Abby Hirsch, Godmothers Dating Service, and Esther Porath, founder of Mid Life Singles of Ohr Kodesh, will discuss "Innovative Approaches for Dating" Monday, Dec. 13, 7:30 p.m. Ohr Kodesh Congregation, 8402 Freyman Dr., Chevy Chase, Md. $4.50 nonmembers (589-3880).

The meeting is sponsored by Mid Life Singles, a "community network of friendship for men and women over 40," says Porarth.

* "Surviving Separation and Divorce," with psychotherapist George Woolley and Elliott Diamond, founder of Fathers United in D.C. and Northern Virginia. Dec. 7, 7:30-9:45 p.m., Immaculate Conception Academy, 2408 K St. NW. Part of the Changing Times, Changing Lives lecture series sponsored by Free Men, Inc. (543-2332).