I'm definitly with you on the idea that marketing is nothing but lies. Its like a sickness.
I do think that there is a lot of good that comes from the internet. It connects people across the world and its a fast and efficient way of transmitting information. But there is a lot of negativity that comes from it as well - experiencing life through screens, judging others and comparing the self to orhers. Similar to what you said about memes i believe that peoples political ideologies have essentially been condensed into memes. I call it "meme politics." People slap a right or left wing phrase onto an image and spread it throughout the internet and combined with all the other memes, these collective bits of data become the lense that people view the political-economic world.
The internet is definitly a two sided coin. For everything good aspect, there is an equal and opposite bad aspect to it. The best advice in my opinion would be that each person should put a reasonable limit on how much they use the internet each day/week and make sure that they go outside, converse with people in person and consume alternative mediums of information at least at some point. Lol