hashtagify.me
Hashtagify helps you accelerate your business growth, brand awareness and marketing effectiveness through intelligent Hashtag Marketing. This technology helps master Hashtag Marketing far more quickly.
LINK: http://hashtagify.me/
hashatit.com
HashAtIt.com is The First Social Search Engine for HASHTAGS (#). Search tags on today’s most popular social networks: Facebook, Twitter, Instagram and Pinterest. It is a quick and easy way to sort through hashtags, bringing all conversation to one place in real time.
LINK: http://www.hashatit.com/
socialseeking.com
Search across various social networks and media channels like Twitter, Instagram, Vimeo, etc.
anoox.com
Social networking based Search engine. Users can vote for their favourite web results.
LINK: https://www.anoox.com/
backtweets.com
Backtweets is a free web app. It lets you search through a tweet archive for URLs, hashtags and usernames that were sent over Twitter.
LINK: http://backtweets.com/
social-searcher.com
Tool for journalists – Social Searcher is a search engine for social networks.
Search multiple social networks at the same time on this free website.
twiangulate.com
Twiangulate is the leading tool for search, analytics and mapping of connections between Twitter friends and followers. It discovers hidden tweeters, friends of friends who only insiders follow or sometimes just friends you haven’t yet seen tweeting.