Tagsdock - Tag Instagram photos instantly from your iOS keyboard.
Poet.so - Capture and share Twitter posts as beautiful images
Jetpack App - The fastest way to copy your hashtags for Instagram
Twitter Ads - Twitter offers targeted ad placement on their ad platform.
Hashtag Suggestions for Instagram - Find the best hashtags for every photo
Tweetlet - Tweetlet is a free tool that lets you create beautiful images from your tweets, text, and any other images in a snap.