There are a lot of people currently expressing new forms of activism, social media is playing a huge part these days.
Most definitely! Social media is one of the biggest ways people get there information right now.
Yes, it's a great way to start what's referred to as 'grassroots' campaigns.
I have heard many references to such, but I am not that familiar with the term. Please tell me more about it. 
Grassroots refers to creating campaigns from the 'bottom-up', rather than from the top-down and are considered as being more natural.
That's very interesting. So the people are supposed to be more involved and there should be less political interference?
Yes. Many people focusing action by word of mouth at the local, regional and national levels.