The Arbor Day Foundation has announced a social media campaign to plant 50,000 trees on behalf of people celebrating Arbor Day while following social distancing measures during the coronavirus pandemic. Through April 24 -- the 148th observance of Arbor Day -- the Foundation will plant one tree for each Instagram, Twitter, or Facebook user who posts a picture of a tree using the hashtag #ArborDayAtHome, up to 50,000 trees.