I do think there is a problem with how tightly some big corporations have locked down social media - but the 1st amendment (and equivalent laws elsewhere) don't cover the requirement that anyone actually listen to your speech.
I think if we see social media as being a necessary modern medium for speech then we're going to need to get a government sponsored something in the mix - whether that is a common required protocol for messaging or a full blown nationalized social network is an open debate we can have. The main issue is that as long as we're blindly trusting the market to fix itself - it has decided the fix is that monopolies are great when nobody is breaking up big tech companies.
I think if we see social media as being a necessary modern medium for speech then we're going to need to get a government sponsored something in the mix - whether that is a common required protocol for messaging or a full blown nationalized social network is an open debate we can have. The main issue is that as long as we're blindly trusting the market to fix itself - it has decided the fix is that monopolies are great when nobody is breaking up big tech companies.