There is speculation that social media is becoming perceived as a trustworthy source of information by a large number of people. The continuous interpersonal connectivity on social media has led to people regarding peer recommendations as a reliable source of information. However, this trust can be exploited by marketers, who can utilise consumer-created content about brands and products to influence public perceptions.
Privacy rights advocates warn users on social media about the collection of their personal data. Some information is captured without the user's knowledge or consent through electronic tracking and third party applications. Data may also be collected for law enforcement and governmental purposes, by social media intelligence using data mining techniques. Data and information may also be collected for third party use. When information is shared on social media, that information is no longer private. There have been many cases in which young persons especially, share personal information, which can attract predators. It is very important to monitor what you share, and to be aware of who you could potentially be sharing that information with. Teens especially share significantly more information on the internet now than they have in the past. Teens are much more likely to share their personal information, such as email address, phone number, and school names. Studies suggest that teens are not aware of what they are posting and how much of that information can be accessed by third parties.
For individuals, social media is used to keep in touch with friends and extended family, network for career opportunities, find people from all over the globe who share a common interest, share content and more. Those who engage in these activities are part of a virtual social network. For businesses, social media is an indispensable tool for finding and engaging with customers, sales, advertising and promotion, gauging trends and offering customer service. Governments and politicians utilize social media to engage with constituents and voters.
Do you have a great sense of style? Are your friends always enquiring where you purchased your latest pair of heels from? Why not make a business out of your hobby? Create a business account on Instagram and start posting beautiful pictures of your latest purchases. You can buy fashion items in bulk and sell them online and earn big bucks by doing what you love.
Use a service like Flickr to get people acquainted with your work, offering photos they can use on their website for free under the Creative Commons license. Once you’ve built up a following, join another stock photography site like Shutterstock or iStockphoto where users will pay for the opportunity to use your pictures on their blogs. You can make up to $120 off of one paid download of your photo. Even if you get compensated at a lower level, the money can really add up if you take a lot of quality photographs.
Social media often feeds into the discovery of new content such as news stories, and “discovery” is a search activity. Social media can also help build links that in turn support into SEO efforts. Many people also perform searches at social media sites to find social media content. Social connections may also impact the relevancy of some search results, either within a social media network or at a ‘mainstream’ search engine.
Concerns have been raised about online "stalking" or "creeping" of people on social media, which means looking at the person's "timeline, status updates, tweets, and online bios" to find information about them and their activities. While social media creeping is common, it is considered to be poor form to admit to a new acquaintance or new date that you have looked through his or her social media posts, particularly older posts, as this will indicate that you were going through their old history. A sub-category of creeping is creeping ex-partners' social media posts after a breakup to investigate if there is a new partner or new dating; this can lead to preoccupation with the ex, rumination and negative feelings, all of which postpone recovery and increase feelings of loss.
UK researchers used a dataset of more than 800 million Twitter messages to evaluate how collective mood changes over the course of 24 hours and across the seasons. The research team collected 800 million anonymous Tweets from 33,576 time points over four years, to examine anger and sadness and compare them with fatigue. The "research revealed strong circadian patterns for both positive and negative moods. The profiles of anger and fatigue were found remarkably stable across the seasons or between the weekdays/weekend." The "positive emotions and sadness showed more variability in response to these changing conditions and higher levels of interaction with the onset of sunlight exposure." 
Even in the United States, the birth-country of Twitter, currently in 2015 the social network has 306 million accounts. Because there are likely to be many multi-account users, and the United States in 2012 had a population of 314.7 million, the adoption of Twitter is somewhat limited. Professor Matthew Auer of Bates College casts doubt on the conventional wisdom that social media are open and participatory. He also speculates on the emergence of "anti-social media" used as "instruments of pure control."
If you are apparently 'wasting' time on the social media, it is the time you need to act smart and do not fo it for free. With no dearth of the startups and companies trying to make a mark on the social media sites, the demand of the SMM is quite high. You will be required to manage different social accounts be it facebook, twitter, Pinterest, Snapchat, Reddit to name few and oh! Even Quora.
Social media may have been influenced by the 1840s introduction of the telegraph in the US, which connected the country. ARPANET, which first came online in 1967, had by the late 1970s developed a rich cultural exchange of non-government/business ideas and communication, as clearly evidenced by ARPANET#Rules and etiquette's "A 1982 handbook on computing at MIT's AI Lab stated regarding network etiquette," and fully met the current definition of the term "social media" found in this article. The PLATO system launched in 1960, which was developed at the University of Illinois and subsequently commercially marketed by Control Data Corporation, offered early forms of social media with 1973-era innovations such as Notes, PLATO's message-forum application; TERM-talk, its instant-messaging feature; Talkomatic, perhaps the first online chat room; News Report, a crowd-sourced online newspaper and blog; and Access Lists, enabling the owner of a notesfile or other application to limit access to a certain set of users, for example, only friends, classmates, or co-workers. Tom Truscott and Jim Ellis conceived the idea of Usenet in 1979 at the University of North Carolina at Chapel Hill and Duke University, and it was established in 1980.