Interesting.
The ones I'm seeing from ONE of my friends:
Chemtrails are toxifying the atmostphere and poisoning the planet
U.S. West Coast completely contaminated with Fukushima radioactivity
The Feds are intercepting cellular and online communications
Monsanto = Death
Fluorinated water kills
Vaccinations kill
Mermaids are real (see YouTube)
Collecting rainwater is becoming illegal across the U.S.
Other friend:
GMO Cloned Babies
Luciferian Agenda
Existence of transhumans
Illuminati children are sacrificing their classmates
Technocratic Revolution is happening
Feds are stockpiling bullets and coffins
Muslim Brotherhood wants to control our schools
I don't know which ones, if any, are true or have a hint of truth (Monsanto?, Fukushima?), but most sound pretty crazy and I don't bother to read about them at all.
For the most part, it seems the people who spend most of their day at home, online, and prone to supernatural belief, are the ones who start believing the craziest conspiracies.