I know it sounds silly but I personally don't care about privacy online, if google or facebook has my data, use it to sell to advertisers, I get better ad preferences and a better online experience overall - a win-win situation

It's fine as long as it stops here.. but the problems start when you begin voicing your political /any other controversial opinions online.. Other users might harass you, doxx you or send your stuff to your employer/ family.
I've seen a lotta people lose their jobs over this.

But this can be seen as a problem of the userbase and not within the platform's privacy policies themselves - as the saying goes "talk shit get hit", which applies to real life, this kind of harassment applies to your online activities.

Finally, social media giants themselves getting involved in politics- censoring out content, promoting their interests etc - is definitely a big issue, only because of which platforms like steemit exist, and can hopefully check on blatant propaganda , even if a little bit

Oh and mangoes are literally the only thing I like about summer ;)