How did myspace & facebook get so big so fast & how ?

[Social Networking123]

How did myspace & facebook get so big so fast because they was like no TV advertising for those 2 companies.How did they market them self to all of these people to sign up 200million,300 million its crazy.
Myspace did not see any activity for 6-9 months and they said they tried marketing and it just did not work.The best marketing is viarl people telling people put if they had not people how did people tell people about myspace ? hit me a line

[rhi]

Well if you start out with 5 people and each person tells 10 friends and those friends tell another 10 friends and until everybody has at least heard of either of them. That's how chat rooms get to be so big because everyone wants to be connected. If you want to do the math, use a calculator. It's all the same with Twitter!