Reddit says it's investigating an attack that flooded the site with pro-Trump content

• A number of Reddit pages were taken over with pro-Trump content Friday afternoon.
• The compromised subreddits that display banners promoting Trump at the time of writing include r/Avengers and r/bannedfromclubpenguin.
• A Reddit spokesperson told Business Insider that it is investigating an incident "related to a series of vandalized communities. It appears the source of the attacks were compromised moderator accounts. We are working to lock down those accounts and restore impacted communities."

A number of Reddit accounts were compromised Friday afternoon, which led to a number of subreddits being overtaken by pro-Trump signage.

A Reddit spokesperson told Business Insider in an email that "an investigation is underway related to a series of vandalized communities. It appears the source of the attacks were compromised moderator accounts. We are working to lock down those accounts and restore impacted communities."

A Reddit post lists the subreddits that are affected, which include r/Avengers and r/bannedfromclubpenguin, which both display pro-Trump content at the time of writing. However, not all of the subreddits have the Trump banners displayed on their pages. For example, r/49ers and r/nfl are among the subreddits listed to have been compromised, but the headers on their pages do not display the pro-Trump icons.

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A post r/Black Mirror shows that the subreddit was at one point compromised and showing the pro-Trump icon, though its header now displays the TV show title.

Reddit is the third social network to be on the receiving end of a hack in recent weeks, following Twitter and YouTube, although they all seemed to have different motives.