Happy birthday Grindr! How GPS ‘dating’ apps changed us all.

(Image: Dazzle Design / for NBC News)

On the day he launched Grindr — exactly 10 years ago this Monday — founder Joel Simkhai said the only phone call he received was from the competitor, Manhunt, with a buyout offer of “$20,000 or $35,000.”

Simkhai declined.

But after actor and comedian…