Why guy likes almost every picture of some girls on IG?

The guy I am currently dating has some very cute single female friends collected on his IG or Facebook account. He likes almost every picture of some of these girls. I have no idea how he knows some of the girls as they are living in totally different countries. He said he likes their pictures because he wants to show his support and he does not care about them. Is it bullshit or he is just bored? I have never dated guys with this kind of "hobby" before,
Why guy likes almost every picture of some girls on IG?
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