No girls on the Internet
From Bibliotheca Anonoma
The Internet: Where men are men, women are men, and little girls are FBI agents. There are no girls on the Internet.
Rule 37 of the Internet: There are no girls on the Internet.
Origin[edit]
On 4chan, anonymous posting is used, it is assumed that all anons are male and college-age.
Because it has been common for males to masquerade as camwhores and girls to excite anons or improve their position, a common joke has come about that there are no (real) girls on the internet.
After many cases of false camwhores teasing anons and never providing nudes, the phrase TITS OR GTFO developed to cut out the bullshit.