A little vague, depending if you mean most famous as in the most watched or the show the most people know of but not necessarily watch.
If it's the latter, then the answer can't possibly be known without doing extensive research, if it's the former, famous in which year? which decade? what genre?
The closest thing to you answer is to check the provided link.
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There isn't a singular "Most Popular" TV show since ratings vary from week to week, month to month, year to year. Then of course are you referring to Network, Cable, Syndicated shows... are you speaking of the Summer season or during the Fall seasons when all the new shows appear.
Also you have to factor in location, the most popular in America, the U.K., Australia, Botswana? It's very hard to determine the "Most Popular" with something as generic as a 'TV Show' when there are and have been thousands of TV Shows through the years and from around the world.
Now, having said all that... American Idol holds the record for the most consecutive spots at Number 1, but that's only for 8 years so it's not necessarily THE most popular.
The best thing you can do is visit the provided link each week and view the Nielsen ratings each week. Naturally of course these are the numbers for America only.
Naturally the numbers will change from season to season but currently, at the end of the 2011-2012 season, the most popular shows (i.e. number of total viewers) are...
Its a serial called FRIENDS Its a serial called FRIENDS Its a serial called FRIENDS
There's not enough information to determine which TV show is the world's most popular.
Generally the star plus serials are more popular.. now days most popular serial on star is Sathiya, Pratigya,Iss pyar ko kya naam du..
Hidden camera TV shows are still popular. Shows such as AFV, Boiling Point, Cheaters, and Spy TV are still popular shows that involve a hidden camera.
I believe Perry Mason was the most popular tv show in the 50s. They started releasing episodes in 1957.
The Bachelor is one of the most popular reality television shows on cable tv in the United States. There have been spinoff versions of the show including Beauty and the Geek, the Bachelorette, and Tila Tequila's.
According to Nielsen and other companies that did television ratings, NBC had the two top programs-- Seinfeld (a comedy) and ER (a hospital drama).
I dont know what the most popular tv soap is but my opinion would be estenders I love eastenders. It is the best tv soap in the world but that is my opinion