Guys, What does it mean when a guy asks for your IG instead of your phone number?

A guy who everyone knows is a player had asked me for my phone number a while back. I texted it to him and we've been in contact ever since. (On and off bc I don't really like the way he treats women.) But a friend of mine came up to me all anxious that he asked for her IG and she wanted to know what to do. I shrugged and asked what does she WANT to do; I'd already warned her that he was a player. He'd been chatting up another gal friend of mine and asked for her number.

I don't get what the difference is between the women he asks for their number and the gal who he only connected with on IG. I'm sure it's part of some game/tally, but I'm curious what the difference is.

Guys, What does it mean when a guy asks for your IG instead of your phone number?
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