Reddit is a social news aggregation site where users can post links and discuss various topics. It has grown to become a large online community with top subreddits including funny, pics, announcements and AskReddit. Users can gain karma points for popular posts and comments. LinkedIn is a professional networking site used to maintain business contacts and find jobs. Users create profiles similar to resumes and can join groups to expand their professional network. Both sites allow users to vote on content to determine visibility.