(CNN) A pair of studies released by the Pew Research Center outlined how the relationship between lawmakers and constituents on Facebook changed after the 2016 election.

On the constituent side, Pew found that of the five possible emotional reactions that Facebook users can use -- "angry," "love," "sad," "haha" and "wow" -- the "angry" reaction became the most likely to be used when users were reacting to posts created by congressional leaders after the election.

Prior to the 2016 presidential election, the "love" reaction had been the most popular. In early 2016, only 2 percent of Facebook reactions to congressional posts were "angry."

In the nine months between the rollout of the "angry" reaction option in 2016 and Election Day, the "angry" button was used to respond to lawmakers' posts 3.6 million times. In the nine months after the election, however, the "angry" reaction increased to nearly 14 million. The use of the "angry" reaction had increased by 385 percent since its inception, far surpassing the extent the other four reaction options were used for congressional posts.

Use of the "love" reaction option also increased after Election Day, but to a lesser extent: Users "loved" congressional posts 7 million times in the nine-month period before the election and 12 million times in the same period afterward.

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