Gaming app on phone?

So my boyfriend and I like to play Scrabble together on the Scrabble Go app. On the app you can direct message each other. This morning I saw a notification pop up on his phone that a female player had messaged him on the app. I'm assuming they have had some sort of communication. I scrolled down, unable to open his phone, but I could also see that he was playing two other females via the notifications. Is this common? I cannot see what these messages are about but do men use these apps to talk to women? Thank you
Gaming app on phone?
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