President Trump’s tweets don’t pack the punch they did at the outset of his presidency. His Twitter interaction rate — a measure of the impact given how much he tweets and how many people follow him — has tumbled precipitously, according to data from CrowdTangle.

Why it matters: It’s a sign that his strongest communication tool may be losing its effectiveness and that the novelty has worn off.

Trump’s interaction rate has fallen from 0.55% in the month he was elected to 0.32% in June 2017 — and down to 0.16% this month through May 25. (The metric measures retweets and likes per tweet divided by the size of his following.)