There are a great variety of platforms to choose from, for every purpose. Here are some to get you started:
Facebook

Gringos Ajijic & Lakeside

Ajijic Newbies

Beg, Barter Buy & Sell – Chapala

Mujeres del Lago (Ajijic and Lake Chapala)

GILM (God I Love Mexico)

Lake Chapala (M)expats

On The Road in Mexico

Mexican National Chili Cookoff

La Cocina de Leslie

My Dear Guadalajara

Lake Chapala Real Estate

Blogs/Websites

Lake Chapala Society

Casa Luna de Miel – Honeymoon House

Jim & Carole’s Mexico Adventure

Journey North – Tracking Migrations & Seasons of Monarch Butterflies

The Other Side of the Tortilla

The Guadalajara Reporter

Feria Maestros del Arte

Expo Enart Tlaquepaque

Day of the Dead

Mexconnect