No. But they should stop short of narcissism. There's folk out there who only ever post selfies of themselves, because reasons.
Typically, they're all dolled up, looking their absolute best, and coming up with self depreciating stuff, angling for further compliments.
No issue when it's a once in the while 'I need an ego boost' type thing. We all need that from time to time. But every post? Multiple times a day? That's plenty, and you've taken it too far.