Facebook is a social network that lets users create a personal profile, add other users as friends, and post status updates, photos and videos. They are also notified once any of their friends have done the same thing.
Users can also join common-interest groups, or create Pages for a person, product, or organization. Because Facebook automatically recommends to you pages that your friends have liked, many existing businesses now encourage people to “like” their pages on Facebook as a marketing strategy.
If you've heard of “tweets”, you've heard of Twitter. It's an online social networking and microblogging service that enables users to post and read text messages. Registered users can read and repost tweets, but unregistered users can only read them.
It has been called “the SMS of the internet”. For people who are only interested in 140-character-status updates from the favorite celebrities, Twitter is a godsend. Users may subscribe to another user to be automatically updated on their tweets. This is known as “following”. A tweet with the highest number of Retweeted becomes a “trending” topic.
LinkedIn is Facebook for the business-oriented. The main feature of the site is that it allows users to maintain a list of contacts which they have some relationship to. These are called Connections.
Typically, any user can invite another to become a connection. Unlike Facebook, though, responses like “I don't know” or “Spam” can be counted against the inviter. Once a user receives too many responses like this, their account is closed.
Pinterest is a visual discovery tool that lets people collect ideas for different projects and interests. Collections (called “boards”) of visual bookmarks (called “Pins”) can be created and shared by users. This is a creative way to collect and organize events, articles, recipes, images, and so on.
Pinterest serves as a personalized media platform. Content can be browsed on the main page, and users have the option to save individual pins to their own board using the “Pin It” button. Content and images found on other sites can also be uploaded to Pinterest by downloading the “Pin It” button to the bookmark bar.
5. Google ++
This is an identity service described by Google as “social layer” that enhances online properties. Aside from being a social networking site (the second-largest, after Facebook), Google ++ is also an authorship tool that associates content directly to their respective website content writers .
By using its enhanced properties, like Gmail and YouTube comments, more than 540 million monthly active users have become part of Google+. Many netizens, however, have voiced concerns. Because many sites now require you to be logged in with your Google+ account, your net activity can be tracked and stored by Google.
Instagram is an online and mobile photo-sharing, video-sharing, and social networking service. It enables users to take pictures and videos, apply digital filters to them, and then share them on other social networking services like Facebook, Twitter, and Tumblr.
The “hashtag” frenzy started on Instagram. To help users find their photos, people would 'tag' their pictures with the appropriate subject like “food” or “drink”. Eventually, some people created entirely new tags. Phrases like “Chillin '” and “YOLO” became popular tags. The “hashtag” has become an internet meme. “HashtagNoFilter” and “HashtagNo MakeUp” are some common examples.
Tumblr is both a microblogging platform and social networking website. Users can post multimedia content to their blogs, and these can be reposted to other blogs using the “reblog” feature. A link that leads back to the original post always accompanies each reblog.
Tumblr users also take advantage of tags to help their content be found. While there is no limit to the number of tags you can put in a post (indeed, many users have taken to putting their comments in the tags) a search engine marketing expert would know that only the first five tags are actually of use. Any tag after the fifth won't show up in a search, even if it is related.