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." 
There are several negative effects to social media which receive criticism, for example regarding privacy issues, information overload 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" 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.
Social media itself is a catch-all term for sites that may provide radically different social actions. For instance, Twitter is a social site designed to let people share short messages or “updates” with others. Facebook, in contrast is a full-blown social networking site that allows for sharing updates, photos, joining events and a variety of other activities.
Facebook jumped by 100 million monthly active users from 2.13 billion in December 2017 to 2.23 billion as of June 30, 2018. The rate of growth seems to continue at 15 million active users per month. So, by the end of the year we should see 2.35 billion Facebook monthly active users. Here’s the post where Zuckerberg announced the news about reaching the 2 billion milestone:
I’ve got a few e-mails relating to sponsored posts but never know if they’re legit. I think one time I replied and they wanted me to post something about how to save money when gambling at casinos. I’m pretty sure that would turn off a lot of readers (not that I have a lot of readers to begin with). Will have to look into it more though if there are ones which are about products/companies that I might actually like
WhatsApp Messenger is a cross-platform instant messaging client for smartphones, PCs and tablets. The app relies on the Internet to send images, texts, documents, audio and video messages to other users that have the app installed on their devices. Launched in January 2010, WhatsApp Inc. was acquired by Facebook on February 19, 2004, for about $19.3 billion. Today, more than 1 billion people use the service to communicate with their friends, loved ones and even customers.
Getty Images Spotted: Hilarious actress and social media maven Blake Lively expertly referencing her CW roots on Instagram. — Kayleigh Roberts, Marie Claire, "Blake Lively Just Pulled a Total 'Gossip Girl' in Her Latest Instagram Post," 9 Dec. 2018 From Christmas cards and cookie decorating to matching pajamas and tree trimming, there are so many moments to share on social media. — Kelly O'sullivan, Country Living, "70+ Christmas Captions for Every Holiday Picture You Post on Instagram," 7 Dec. 2018 Red-carpet dressing is just one aspect of how Carolina Herrera now communicates with potential customers—social media presence is also growing as e-commerce becomes more important. — Chloe Malle, WSJ, "How Designer Wes Gordon is Reimagining Carolina Herrera for the Next Generation," 6 Dec. 2018 The complaint provided a clear picture that there is still a hidden but powerful Russian social media effort aimed at spreading distrust for American political candidates and causing divisions on social issues such as immigration and gun control. — Michael Balsamo, The Seattle Times, "House GOP campaign arm targeted by ‘unknown entity’ in 2018," 4 Dec. 2018 Stay informed Follow anti-hunger advocacy organizations, such as @APATTusa and @mazonusa, on social media. — Sandy M. Fernandez, Woman's Day, "How Three Women Are Pioneering to End Hunger in the U.S.," 14 Nov. 2018 The brand is spreading the artist's mantra with an #ArtIsForEverbody social media campaign. — Lauren Alexis Fisher, Harper's BAZAAR, "Alice + Olivia Turned Keith Haring’s Iconic ‘80s Art Into a Wearable Collection," 7 Nov. 2018 Police departments are already scanning crowds and protests to find and arrest people with outstanding warrants by cross referencing footage with social media profiles. — Diana Budds, Curbed, "Facial recognition is becoming one of the 21st century’s biggest public space issues," 19 Oct. 2018 Since breaking onto the pop culture scene in 2013, model Emily Ratajkowski has made a name for herself as a proud feminist, social media superstar, and actor, racking up film credits in films like Gone Girl and I Feel Pretty. — Hannah Morrill, Allure, "Emily Ratajkowski's Best Beauty Looks of All Time," 11 Oct. 2018
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.
Whether you choose to promote your products, services, or talent, leveraging the power of social media can help you take your business to the next level. That is with the right plan and strategy, of course. That is why at this year’s Entrepreneurs Summit, experts will be sharing tips and advice to help business owners and entrepreneurs monetize their online presence.
Users typically access social media services via web-based technologies on desktops and laptops, or download services that offer social media functionality to their mobile devices (e.g., smartphones and tablets). As users engage with these electronic services, they create highly interactive platforms through which individuals, communities, and organizations can share, co-create, discuss, and modify user-generated content or pre-made content posted online.