staff:Hey, what’s this green dot in my messages?That dot lets you know when someone’
staff: Hey, what’s this green dot in my messages? That dot lets you know when someone’s been on Tumblr recently. Send them a message, why don’t ya? Take note: You can hide your own activity status by adjusting your privacy settings (under “Availability” on web), if you want to. -- source link
#new features#activity status