Barney's Blog: Throughout the series, Barney makes references to his blog. CBS hosts and updates a copy of Barney's Blog.
Swarley.com: In the episode 'Swarley', Barney at the end tries to pretend he loves his new name to avoid being called Swarley again. Though it is not shown in the episode, there is a website called Swarley.com about it.
TedMosbyIsAJerk.com: In the episode 'The Bracket', it is revealed that one of Barney's former one-night-stands, whom he told that his name was Ted Mosby (in 'Ted Mosby: Architect'), created a website denouncing him. There is also TedMosbyIsNotAJerk.com.
Marshall and Lily's Wedding: A website with videos and pictures of Marshall's and Lily's honeymoon, never shown on the show (the honeymoon part was never shown).
LilyAndMarshallSellTheirStuff.com: In Season 3, Episode 19 ('Everything Must Go') Marshall made a site so Lily could sell some of her clothes to pay for the contractor who will fix the floor in their new apartment. They promoted the site at the end of the episode, saying that it was a chance for fans to bid for memorabilia from the show. The proceeds were given to the Children's Hospital of Los Angeles. The site was shut down after the auction was completed.
GuyForcesHisWifeToDressInAGarbagebagForTheNextThreeYears.com: The site is Lily's counterpart suggestion to Marshall's idea of a web site for selling her clothes, which was part of the plot for the Season 3 episode Everything Must Go.
Mysterious Dr X: The website of Ted's "mysterious" identity when he was in college, as seen on the episode The Possimpible : Mysterious Dr X
Barney's Video Resume: In the episode 'The Possimpible', Barney reveals that he has created an online video resume.
WeddingBrideMovie.com: In the episode 'As Fast As She Can', it is revealed that Tony wrote a screen play entitled "The Wedding Bride" that became a big hit and has an "official" website WeddingBrideMovie.com that was referenced during the episode.
canadiansexacts.org: In the episode 'Old King Clancy', Barney reveals this site as the source of his knowledge of Canadian Sex Acts and has it bookmarked on his laptop.
slapcountdown.com: In the episode 'Wait For It' (and again in 'Slapsgiving') Marshall debuts this website to torment Barney by counting down the days until he next gets slapped, the result of their Slap Bet. Visiting the website prior to the airing of 'Slapsgiving' displayed the same countdown as featured on the show, albeit counting down until the air time of the episode; after the episode aired, the site redirected to CBS' How I Met Your Mother YouTube channel.
itwasthebestnightever.com: In the episode "The Sexless Innkeeper", Marshall made this website after he and Lily went on a couples date with Barney and Robin. It features a picture montage of the evening and a music video of Marshall and Nuno Bettencourt of Extreme called "Best Night Ever", in which Marshall describes what a great time he and Lily had with Robin and Barney. The video was a parody of Extreme's "More Than Words" video, in which the entire main cast of How I Met Your Mother made appearances.
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