Twitter users posting images or symbols of hate will be subject to stricter enforcement beginning this week thanks to new guidelines meant to help prevent the spread of hateful imagery.

Initially announced one month ago, the new guidelines went into effect on Monday and will begin labelling user posts that include images and symbols that might be considered hateful as “sensitive media,” giving other users an opportunity to avoid that material if they so choose.

Likewise, Twitter will also prohibit threats and abuse directed at others via profiles and usernames, and will also begin to accept reports from users concerning profiles or users thought to be in violation of the new Twitter policy. Previously, users could only report specific posts thought to be offensive and not specific users.

According to the policy, now being targeted are “logos, symbols or images whose purpose is to promote hostility and malice against others based on their race, religion, disability, sexual orientation or ethnicity/national origin."

Although no specific list of banned images, logos or symbols exists, Twitter will review each complaint it receives on a case-by-case basis, promising to remove content that threatens, glorifies or celebrates violent acts and to ban repeat offenders.