Successful online campaigns use a variety of tools. Hashtags, for example, can raise awareness and unite an online community. And activists can protect their identities with online encryption and anonymity.

For women, being online can be dangerous. But being cut off from the internet is also problematic. From online hate speech to the digital divide, women who are politically active have to deal with numerous challenges.

Tatyana Kurbat is from Belarus. Masih Alinejad is from Iran. Both women now live in exile, and they are using the Internet and social media to support the fight for change in their respective home countries.

Trees have the potential to suck excess CO2 out of the atmosphere. An Indian company uses drones to beef up barren woodlands and create brand new forests, planting seeds of hope — even in areas that are hard to reach.

The more diverse the better: A principle that applies not only to data, but to research teams as well. Without diverse viewpoints when flagging terms for content moderation, the resulting algorithms will be faulty.

Protection from hate speech on Facebook thanks to AI? Whistleblower Frances Haugen says it doesn't work in every language. That's why social media is still being used to incite hate and violence online.

AI makes decisions regarding many areas of our daily lives - from medical care, to news feeds, to job opportunities. But AI isn't always neutral. That's why we have to include diversity in our AI, to exclude biases.

People who stand up for human rights often put themselves in danger. The dark web offers activists, journalists and people who are politically persecuted a space for encrypted communication and anonymity.

Digital technologies are data-driven. But who has access to the data, and who is allowed to use it? Digital sovereignty means that people can decide for themselves how their data is used.

Lina Khan is the chair of the US Federal Trade Commission. She is a strong critic of the big tech companies, and is calling for antitrust legislation that can respond to changing conditions in a digital economy.