I heard on a tv show that every photo you take on your cell phone stays in the cloud forever. T/F?

great, everyone is going to see my junk forever?

False, just ask yourself how many people you know who when they've broken a phone have never been able to get those photos back!

does it matter.

 I wanted to keep an eye on my son and installed the Phone Control software on his phone... photographs and music are automatically synced and stored in the cloud. If you're unsure, ask your cellular provider for assistance; they'll be able to confirm... or learned if there's a software I might run on my Pcor system to test or any of these stuff...

It depends on your settings and how you manage your accounts. If you set your camera to send every picture you take to your cloud account automatically and then don't bother checking the photos in your cloud account then yes, there's that chance those pics will stay there for a very long time. Forever is a bit harsh though. At some point, you will use up your space allowance or you'll forget your password somehow and the account will be deleted after some period of inactivity. That is unless the owners of the cloud server decides to take down the server itself for a new improved paid version.

there must be plenty of clouds with photos in them then ..ohh no its raining pictures ...only a troll would ask a silly question like that , i wont give the answer ..lol

Most modern smartphones have a backfile in the built itself so even when you delete the photo there might be a chance that it's still somewhere hidden in your memory. And as for the cloud situation as long as there is an internet connection to your phone and has an automatic cloud setting there is a "Chance" that it might be on the cloud. But there is no way a normal person who doesn't even work for these tech giants and is into smartphone algorithm structure will know about it. 

Only if you put it there, and then, they can be deleted so that is a bit false.

Technically that is possible, 

but there is no certainty that your uploaded pix are kept anywhere 

if you delete them.    

Anything and everything you upload to the Cloud is out of your control the moment you send it.  Install a high capacity micro SD card in your phone to save your photos, data files, music, etc...  Saving movies that are in public distribution to the Cloud is safe enough though.