What does it mean when a guy follows you on social media the moment he got that app?

There's this crush i really really like <3, he has been showing signs that he likes me but he seems to flirt with a particular girl which is unfortunately... my enemy, i don't actually know if he is trying to make me jealous or if he actually likes that girl, this girl although, does not have social media, so he can't actually follow her, but there was a few times where, when he got instagram, he immediately followed me as soon as he downloaded the app, it once again happened when he got twitter, i know he followed me immediately because i was one of his first few followers.
What does it mean when a guy follows you on social media the moment he got that app?
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