What does this mean on an iPhone?

The other day my husband was showing me a YouTube video on his phone, when he swiped up to brighten the screen I saw a little circular icon/photo 1 of his best friend and another of a girl he used to date, I've never had this on my phone so I'm not sure what it means, does that mean those same people liked that video or does that mean he has an open text or chat with those people? I'm just a little confused.

It's hard to say what you saw. It wouldn't be unusual to have his ex's contact in his phone that he never deleted. IPhone contacts show up with a picture circle. Otherwise it's alittle hard to find, but you can always login to your cell phone company's website to see what phone number's he's calling in the log.