The practice of growing happiness by recognizing negative thoughts, understanding their origins, and choosing ones that actually make you feel happy.
Becoming a happtivist and practicing happtivism isn't like joining any organization or religion. It means being committed to being your own happiness activist.
Politically motiviated hacking. Some examples include denial of service attacks against conservative groups, defacement of political websites, malicious software development, and website parodies. Tends to be leftist and has close ties with anarchy.
A conjunction of "hashtag activism"; a useless, noxious form of "activism" that takes place in 144 angry, hateful characters or less. This is usually a response to taking offense to something, but ironically is often more offensive than what it is responding to.
If your tweets are angry ramblings about what you find offensive and inappropriate followed by numerous hashtags meant to blame and demean your subject, you are guilty of hagtivism.