<human>: Can you condense the text into a few key points?

Context: Single parent, open and permissive family environment, etc. My son is not technically banned from doing anything, but he's bright and generally understands why some things are OK and some are not.

So today, he just drops into random conversation that he thinks he's finally found a good match on Tinder. I baulked immediately, saying that dating apps weren't intended for under 18s, so he's probably not legally allowed to be on there. He says this isn't true, and I haven't checked yet, but as he'd be happy to point out, we're not exactly squeaky clean in terms of law abiding, and he wanted to know why I objected in general to a 15 year old using a hookup app.

I've been a bit low recently, and my depression is making me foggy, so I'm not totally sure that I'm not having a knee jerk reaction for no good reason. I'm having trouble amalgamating my thoughts without the instant "No, ew!" comeback involved. I did point out that the internet makes it very easy for young teens to be abused and manipulated, but he says he's snapchatted with her, so he knows it's a real girl, and I can't seem to convince him that the person's gender could be the least of his concern. He's quite trusting as a person, has excellent grades, and has recently got himself an occasional job, and I'd hate to see him fuck that up somehow because he trusted the wrong person on the internet. So, what would you do/say in my shoes?
<bot>: My 15 year old son is using Tinder. It feels wrong to me, but I'm having difficulty explaining myself on the matter. Thoughts?