This is a social bookmarking web service for discovering, storing and sharing web bookmarks. The site was founded by Peter Gadjokov and Joshua Schachter in 2003 and acquired in 2005 by Yahoo. By the end of 2008, Delicious claimed that it had bookmarked 180 million URLs and acquired more than 5.3 million users. The service was later sold to AVOS Systems in April 2011 who later sold it to Science Inc. In January this year, Delicious Media said that it had acquired the service.
First of all, thanks for sharing this list. It’s really useful, but it would be great to supplement it with some kind of statistics regarding the audience who is using each of these social networks. This statistics could be valuable for different kind of marketers, bloggers or business owners because with such statistics it would be possible to plan a strategy for business in different niches, like e-commerce, paperhelp online, any kind of services, or use it for the purpose of self-promotions for bloggers/website owners.
Some employers examine job applicants' social media profiles as part of the hiring assessment. This issue raises many ethical questions that some consider an employer's right and others consider discrimination. Many Western European countries have already implemented laws that restrict the regulation of social media in the workplace. States including Arkansas, California, Colorado, Illinois, Maryland, Michigan, Nevada, New Jersey, New Mexico, Utah, Washington, and Wisconsin have passed legislation that protects potential employees and current employees from employers that demand them to give forth their username or password for a social media account.[60] Use of social media by young people has caused significant problems for some applicants who are active on social media when they try to enter the job market. A survey of 17,000 young people in six countries in 2013 found that 1 in 10 people aged 16 to 34 have been rejected for a job because of online comments they made on social media websites.[61]
Hundreds of brands across various industries indulge in social media influencer marketing. However, with the sheer volume of influencers out there, brands have a hard time picking out the genuine ones from the crowd. That's where your influencer marketing consultancy steps in. You help brands identify the right influencers for their campaign and guide them each step of the way – right from communicating with the influencers on a daily basis to measuring the success of the campaign.
Welcome to The Beginner's Guide to Social Media! Whether you're new to social media or just looking to close a few knowledge gaps, we're glad you stopped by. By now, we've all heard how valuable—even essential—social media can be. Whether your current sentiment leans more toward enthusiasm or trepidation, there's no way around the fact that social media is a far more complex field than it first seems. Diving in without a sense for what it's like can be overwhelming, and building a network that provides real value takes both savvy and hard work, but fear not—we're here to help! We hope you'll find this to be one of the most comprehensive social media resources available, and that no matter what your skill level is, there's plenty in here to help you improve your social presence. What are we waiting for? Let's dive in!

Hi Maina, I have checked the social sites recommended by you. May be itis important to update on your article that Delicious no longer accepts bookmarks as it is now bought by Pinboard. Most of these social sites are being bought off and may discontinue their programs. May be you can even dedicate a new post for that. Otherwise, great piece of work there.
There are several negative effects to social media which receive criticism, for example regarding privacy issues,[137] information overload[138] and Internet fraud. Social media can also have negative social effects on users. Angry or emotional conversations can lead to real-world interactions outside of the Internet, which can get users into dangerous situations. Some users have experienced threats of violence online and have feared these threats manifesting themselves offline. Studies also show that social media have negative effects on peoples' self-esteem and self-worth. The authors of "Who Compares and Despairs? The Effect of Social Comparison Orientation on Social Media Use and its Outcomes"[139] found that people with a higher social comparison orientation appear to use social media more heavily than people with low social comparison orientation. This finding was consistent with other studies that found people with high social comparison orientation make more social comparisons once on social media. People compare their own lives to the lives of their friends through their friends' posts. People are motivated to portray themselves in a way that is appropriate to the situation and serves their best interest. Often the things posted online are the positive aspects of people's lives, making other people question why their own lives are not as exciting or fulfilling. This can lead to depression and other self-esteem issues as well as decrease their satisfaction of life as they feel if their life is not exciting enough to put online it is not as good as their friends or family.[140]

The idea that social media are defined simply by their ability to bring people together has been seen as too broad, as this would suggest that fundamentally different technologies like the telegraph and telephone are also social media.[18] The terminology is unclear, with some early researchers referring to social media as social networks or social networking services in the mid 2000s.[4] A more recent paper from 2015[2] reviewed the prominent literature in the area and identified four common features unique to then-current social media services:
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