The Cub who may be the most popular right now is Javier Baez, who has added more than 23,000 new followers on Instagram and more than 9,000 on Twitter since Game 1 of the NLDS, according to Crain's Chicago Business. Baez hit the game-winning RBI single in the four-run ninth inning on Tuesday in Game 4.
That rally prompted an outburst of excitement by Cubs players on social media.
Outfielder Matt Szczur, who was not on the NLDS roster but was traveling with the team, added a photo of the champagne-soaked players on the mound at AT&T Park.
Ben Zobrist and his wife, Julianna, joined the fun.
Julianna also posted a photo of them hugging.
Kyle Schwarber, who sustained a season-ending knee injury in the third game of the year, traveled with the Cubs to San Francisco and was their biggest cheerleader.
Aroldis Chapman may be fairly new to the Cubs, but he also celebrated on Twitter.
Even actor and comedian Bob Newhart joined the party, posting a photo of himself holding a "W" flag in front of the television after Chapman struck out Brandon Belt for the final out.
Chicago native and actress Bonnie Hunt posted a photo of herself and late Cubs third baseman and broadcaster Ron Santo on Twitter.
Former Bulls player Scottie Pippen also commented: "Just when you thought they were down and out ... redemption! Incredible victory for the @Cubs. On to the next one. #FlyTheW"
The Giants may have been eliminated, but they made a classy move in congratulating the Cubs on Twitter: "Congrats @Cubs fans! What a thrilling, unforgettable series. Good luck in the next round."
Carrie Muskat has covered the Cubs since 1987, and for MLB.com since 2001. She writes a blog, Muskat Ramblings. You can follow her on Twitter @CarrieMuskat and listen to her podcast. This story was not subject to the approval of Major League Baseball or its clubs.