I'm brand new to Instagram. I searched powerlifting because I wanted to see some freaks lifting heavy weight BUT all there is is skinny guys deadlifting a million ten pound bumper plates. They're not kidding anyone. 
Obviously you aren't following the right people lol. Look for jeremyhamiltonswife, Brandon Lilly, Andrey Malanichev, ironoplot, russianlifters...
In for big strong beefy man-pics
Rookie mistake. You signed up for instagay, not Instagram
Sounds like the "why does this website pull up gay ads" situation. 
Beeeeep
Don't worry about me I'm following a bunch of whores
I have Instagram to share cat pics with my family.
I can't think of any other non-gay use for it. Sorry.