Scott Dickens, Hayden's team and roommate, was one of the first to celebrate Canada's sixth medal of the Games.
"My roomie Brent Hayden just got a bronze in the 100 free, way to go Brent, knew you had it in you. So proud of you!," Dickens said via Twitter.
Melanie Booth, a defender with the Canadian women's soccer team in London, also posted an emphatic note on Twitter.
"Heck ya...Hayden with the bronze!!!!!!," tweeted Booth.
Winter Olympians also took to Twitter to celebrate Hayden's bronze. Two-time Olympic champion speedskater Charles Hamelin felt so elated he said he lost his voice.
"No more voice because of Brent Heyden Bronze medal! WOW what a race! #GoCanadaGo," posted Hamelin to the microblogging site.
Canada's other medallists on the day took to Twitter themselves. Rower Will Crothers, who won a silver medal with the men's eight rowing crew, posted a photo of his medal to Twitter.
"Just had the race of my life!!!! Thanks to everyone for all the support, it feels great to get some hardware for CAN!!! http://t.co/PeRAFvBQ," posted Crothers.
Women's hockey star Hayley Wickenheiser also praised the men's eight, adding a note to cyclist Clara Hughes, who said she had competed in her final Olympic race.
"Great racing Clara, you epitomize guts! Awesome silver mens 8...amazing podium finish!@CDNOlympicTeam #london2012#giveyoureverything," Wickenheiser tweeted.
Michael Yerxa of MTV's "1 girl 5 gays" called for even bigger praise for Hughes.
"Clara Hughes finishes 5th at age 39 in her last Olympic race. Can we put her on some currency already please?," tweeted Yerxa to his more than 25,000 followers.
The day started with a dramatic tweet from swimmer Ryan Cochrane.
"Just got pickpocketted on my way home. There's an upside though: he wasn't very good and a bunch of people caught him #peopleareawesome," tweeted Cochrane.