Poet.so - Capture and share Twitter posts as beautiful images
DUSK - Anonymous live video
Twitter Ads - Twitter offers targeted ad placement on their ad platform.
Periscope on Twitter for iOS - Stream live video inside your tweets
Tweetlet - Tweetlet is a free tool that lets you create beautiful images from your tweets, text, and any other images in a snap.
Live Video On Tumblr - Tumblr's answer to Periscope, Facebook Live and Twitch