EXCLUSIVE TMZ.com Diddy<strong style="box-sizing: border-box;"></strong> is helping shine a light on a group of children battling cancer ... and now the kids are getting brand new iPads. Here's the deal ... former celebrity weed dealer <strong style="box-sizing: border-box;"> Milk Tyson</strong>  launched a viral campaign to get Diddy to join their crusade to help kids fighting cancer, and get them a segment on the 'Ellen Degeneres<strong style="box-sizing: border-box;"></strong> Show.' The children at Miami-based nonprofit Fighting All Monsters appeared in a viral video with Snoop Dogg, dancing to Diddy's hit song "Bad Boys For Life" and asking him to vibe with them. Diddy caught wind of the initiative, and blasted the video out Thursday to his nearly 16 million Instagram followers, and now the group says tons of folks want to get involved. Since Diddy's re-post, we're told someone donated 100 iPads -- worth $21,000 -- to the children in the video ... and an exec at Apple asked the nonprofit about ways to aid the kids. What's more, we're told FAM -- which supports pediatric cancer patients …