The CDC says flu season is underway. Photo credit: Getty Images.

Flu season is in full swing, with the Centers for Disease Control and Prevention reporting 20 states with high disease activity this year.

With so much sniffling, coughing and sneezing making the rounds, ABC News Health held a tweet chat on Tuesday to help you protect you and your family from this seasonal illness.

During the hour-long chat, there were more than 1,700 tweets from top organizations, hospitals and flu sufferers from all over the country. Our statistics show that the chat had nearly 40 million social media "exposures" - that's 22 million fewer people compared to the numbers exposed to the flu each year, according to the Robert Wood Johnson Foundation.

In case you missed the chat, it's not too late to learn everything you need to know about the flu. Here is a sampling of the best tweets from the hour.

What's the strain of flu this year?

T1 Remember #H1N1? It's the most common #flu so far this year. Here's a pic from @CDCFlu labs #abcDrBchat @abcDrBchat pic.twitter.com/MP22k8sFus

- Chas Eby (@chas_eby) January 14, 2014

T1: How #swineflu behaves differently from other strains: http://t.co/6XIUQozLwd #abcdrbchat

- U of U Health Care (@UofUHealthCare) January 14, 2014

Who is at greatest risk for getting the flu?

T3 Infants & elderly at highest risk of bad #flu outcomes but seeing young adults hit hard this season, too #abcDRBchat

- Dr Ryan Shelton (@ryansheltonMD) January 14, 2014

#abcDrBchat T3: Anyone who is not vaccinated is at risk of getting the #flu.

- APHA Get Ready (@GetReady) January 14, 2014

Q: @CDCFlu half of flu patients are obese (as is the nation) is there a relationship? Immunes sys inflammatory note? #abcDRBchat T3

- Kat Ellington (@katellington) January 14, 2014

Is there a difference between the cold and the flu?

T4: It can be hard to differentiate the flu from a cold but these tips can help #abcdrbchat pic.twitter.com/fFhx0mF1qI

- RxWiki (@RxWiki) January 14, 2014

Our experts say vaccination isn't perfect but it's the best way to prevent the flu.

T6: It is still not too late to get the #flu shot NOW! It's widely available #abcDRBchat

- Stony Brook Medicine (@StonyBrookMed) January 14, 2014

62 million Americans get the seasonal flu each year: http://t.co/gKLfCJkw3E #abcDrBchat pic.twitter.com/vvlDLNER17

- RWJF PublicHealth (@RWJF_PubHealth) January 14, 2014

@abcDrBchat Flu vaccines work. If you haven't been vaccinated yet this season, now is the time. pic.twitter.com/UBUUs5b6Ox #abcDRBchat

- CDC Flu (@CDCFlu) January 14, 2014

Some other great tips for flu prevention.

T8 DrBergen Wash hands, avoid sick people, get plenty of sleep, eat right. If you DO get sick, stay home. #abcDRBchat

- KPNorthernCal (@kpnorcal) January 14, 2014

T8: Get plenty of rest, stay hydrated and germ-free. The small things can lead to big-time issues with the flu #abcDrBchat

- GetInsured (@GetInsuredTweet) January 14, 2014

T8 Your best defenses against flu: wash your hands, cover coughs & sneezes, and (as best you can) stay away from sick people #abcDRBchat

- Dr. Claire McCarthy (@drClaire) January 14, 2014