Twitter is proving a tour de force when it comes to mobilizing around a cause (#OccupyWallStreet, anyone?), and the natural products industry is no exception. Food advocacy is a major focus of discussion on Twitter, propelled by journalists, companies and Twitter chats such as #naturalchat and #agchat.

If you're interested in spreading the word about Big Ag, genetically modified organisms and taking back our food system, it's important to keep good company. Follow these Twitter users who aren't afraid to take on the conventional food system.

@Food_Democracy
Food Democracy Now! is a grassroots community dedicated to building a sustainable food system. Join nearly 11,000 followers to receive tweets about food policy from the organization's founder.

@JustLabelIt
While they're just getting started at 60 followers, the Just Label It campaign promises to go far, given support from its long list of notable supporters and an advisory committee that reads like a who's who of the organic industry.

@SustainableAg
The National Sustainable Agriculture Coalition, a grassroots alliance advocating for federal policy reform, is nearly 1,000 followers strong on Twitter. Keep up with their tweets geared toward influencing agricultural policies.

@TrueFoodNow
About 2,500 users follow the tweets from the True Food Network at the Center for Food Safety (CFS). CFS works to protect human health and the environment by curbing harmful food production technologies and promoting sustainable agriculture.

@MarionNestle
Marion Nestle, professor at New York University and author of Food Politics, was just named one of Forbes' 7 Most Powerful Foodies. At 75,000 Twitter followers, we agree.

@OrganicCenter
Based in New Hope Natural Media's hometown of Boulder, Colo., The Organic Center generates peer-reviewed scientific information on the benefits of organic farming for society. Some 800 followers get tweets on legislation and key happenings in the organic world.

@TheOrganicView
Organic View Radio, an Internet radio show, touches on all of the issues impacting the organic industry, including proposed regulations, the environment, politics and sustainability. Organic activist and host June Stoyer has a reach of nearly 100,000 followers.

@GEFoodNews
Genetically Engineered Food News is focused on informing consumers of the dangers and effects of genetically modified organisms on the food supply. Nearly 2,000 followers receive tweets about GMO legislation, science and safety.

@RealFoodMedia
At 30,500 followers, this collection of bloggers calls itself "the first traditional and slow food blog network." Real Food Media writes about and advocates for whole, organic and nutrient-dense food from small farms.

@SlowMoney
With a new economic vision, Slow Money is an emerging network of investors, food entrepreneurs and organic farmers who believe in putting money back into local food enterprises and increasing the amount of organic matter in soil. The organization has about 7,400 followers.

If you're looking for more folks worth following in the natural and organic industry, see 50 natural industry influencers on Twitter.

Who do you follow on Twitter? Share in the comments.